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Environmental | NEPA Process

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NEPANational Environmental Policy Act

  • Section 106: National Historic Preservation Act, Archaeology, Architectural History
  • ITD History: Publications & Resources

Human & Physical Environment – Air Quality, Community, Environmental Justice, Hazardous Materials, Noise
Natural Environment

  • Aquatic Resources
  • Biological Resources
    • Personnel Qualifications | Programmatic Biological Assessment (PBA) Info


  • Memos & Standard Operating Procedures
  • Outside Agency Master List
  • Planning & Public Involvement
  • Training
  • Best Management Practices Manual
  • Environmental Process Manual

Stormwater – Managing pollutants properly to protect surface waters

Wildlife – Mitigation for reducing risk to wildlife & prevent crashes

  • Fish Passage & Wildlife Crossings
  • Ongoing, future & completed projects
Environmental Services ManagerWendy Terlizzi208-334-8629
Biological Resources (Biology/Policy)Julie Hausknecht208-334-8472
Community Resources (Environmental Justice)Ester Ceja208-334-8897
Stormwater Program | Aquatic ResourcesSarah Hansen208-334-8551
Architectural HistorianVacant
State Highways ArchaeologistMarc Munch208-334-8449
ArchaeologistTravis Pitkin208-334-8403
NEPA ProcessVacant

The District staff has knowledge in a broad range of areas including environmental analysis, threatened and endangered species, traffic noise, air quality, stormwater, wetlands mitigation, and permitting. They work directly with local, state, and federal agencies, along with the public in avoiding or minimizing project impacts. The planners prepare and coordinate environmental documents in compliance with NEPA.
Below are the Environmental specialists located at the six ITD districts within Idaho.

DISTRICT 1  • North Idaho | Coeur d’Alene Office Mike Hartz
Sr. Environmental Planner
DISTRICT 2  • North-Central Idaho | Lewiston Office Shawn Smith
Sr. Environmental Planner
  • North-Central Idaho | Lewiston Office Neal Scott
Environmental Planner
DISTRICT 3  • Southwest Idaho | Boise Office, 8150 Chinden Blvd. Greg Vitley
Sr. Environmental Planner
  • Southwest Idaho | Boise Office, 8150 Chinden Blvd. Chris Branstetter
Environmental Planner
  • Southwest Idaho | Boise Office, 8150 Chinden Blvd. Scott Rudel
Environmental Planner
DISTRICT 4  • South-Central Idaho | Shoshone OfficeConnie Jones
Sr. Environmental Planner
  • South-Central Idaho | Shoshone OfficeBrett Sergenian
Environmental Planner
DISTRICT 5  • Southeast Idaho | Pocatello OfficeAlissa Salmore
Sr. Environmental Planner
  • Southeast Idaho | Pocatello OfficeChuck Heisler
Environmental Planner
DISTRICT 6  • East Idaho | Rigby OfficeChad Jensen
Sr. Environmental Planner

Transportation Committee for Environmental Consistency (TCEC) Forum is for environmental personnel from ITD, FHWA and the consulting community regarding transportation, environmental, procedural, and technical subjects. The group will host an informational coffee with predetermined discussion topics as listed in the schedule below.

These meetings foster communication between ITD environmental staff and consultants working on (or potentially working on) ITD projects. It is a way for the environmental professionals at ITD, Federal Highway Administration (FHWA), Ada County Highway District, Local Highway Technical Assistance Council, Army Corps of Engineers, and other partnering agencies to give updates on policies, regulations, processes, issues, statutes, work plans, etc.

Participants should bring discussion items related to the topic. Coffee and snacks will be supplied by presenters.

  • Dates: 4th Thursday of every other month | Meeting Time: 9:00 – 10:30 a.m.
DateTopicsLocationAdditional Information
May 12, 2022Julie will present the updated Programmatic Biological Assessment (PBA), including what has changed. She will provide an overview of the PBA Project Pre-Notification (ITD 0289) “smart” form and discuss a variety of tools that will be available to assist the districts and consultants through the process.
PBA Training Presentation
**Please see the Natural Environment tab on this webpage for:
• Personnel Qualifications
• PBA and Appendices
• PBA Biological Opinions
• PBA Commitments Crosswalk Table
9-10:30 a.m.
TEAMS meeting
Presenters: Julie Hausknecht and Melinda Lowe, ITD Headquarters Senior Environmental Planners
February 24, 2022US Army Corps of Engineers | Recent and upcoming changes to Waters of the United States, 2022 Nationwide Permits renewal, and stream mitigation process.
Additional information: 2019 NWW Delineation Guidance
PowerPoint slide presentation
Play Meeting Recording (Microsoft Teams Meeting)
1-3 p.m.
TEAMS meeting
Shane Skaar, USACE Boise Regulatory Office
October 28, 2021Rocky Point Wildlife Crossing project | Bio-Engineering - Incorporating salmonid habitat into roadside streambank stabilization designs
Play Meeting Recording (1 hr. 20 min. - WebEx)
9 AM
WebEx meeting
Matt Pieron, ID Fish and Game
Alissa Salmore, ITD District 5
Katie Salsbury, Intermountain Aquatics
August 26, 2021U.S. Army Corps of Engineers (USACE) jurisdiction based on the Navigable Water Protection Rule (NWPR), the implementation of the NWPR for common transportation projects, changes within the 2020 Nationwide Permit Program (NWP) applicable to transportation projects, and USACE Walla Walla District updates to Wetland and Stream Mitigation.9 AM
WebEx meeting
Shane Skaar, US Army Corps of Engineers
July 1, 2021DEQ Primacy Transfer and PEL
Play Meeting Recording (61 min. - WebEx)
Idaho DEQ Primacy Presentation
Idaho DEQ Primacy Construction General Permit (CGP)

DEQ Primacy Transfer - Idaho Department of Environmental Quality’s (IDEQ) primacy transfer, the Construction General Permit (CGP), and its implications for ITD. Administration of the EPA CGP transferred to IDEQ on July 1, 2021. What is changing, what stays the same, and looking forward to the 2022 CGP.

PEL - Planning and Environmental Linkages (PEL) are a tool that allows Departments of Transportation to look at environmental and community resources that are intersected by a potential project’s footprint prior to starting NEPA. Due to the new timeframes for completion of Environmental Assessments and Environmental Impact Statements PELs will become a vital tool for ITD.
9 AM
WebEx meeting
HQ Auditorium
3311 W State St. Boise, ID 83703
Matt Carlson, ITD HQ Stormwater SME
Wendy Terlizzi,
ITD HQ Environmental Services Manager
April 22, 2021

Jacobs Digital Solutions for Improved Efficiency and Accuracy for Environmental Data Collection
Play Meeting Recording (52 min. - WebEx)
Presentation on custom digital tools developed by Jacobs programming and biology staff to improve efficiencies in delineation, surveys, and vegetation monitoring.

Jacobs Omni is a mobile app that allows for digital collection of delineation data that reduces post processing of delineation datasheets and reporting. Jacobs also has developed several standard web applications for biological surveys and mitigation monitoring to collect, store, analyze, report project data and reference it geospatially if desired.
9 AM
WebEx meeting

Gretchen Herron
Neil Young &
Peiter De Wolfe
Jacobs Engineering
February 25, 2021

ITD and IDFG working together on wildlife vehicle conflict data
Play Meeting Recording (1 hr. & 12 min. - WebEx)
Wildlife vehicle conflict (WVC) data in combination vehicle crash data and migration data from the Idaho Department of Fish and Game (IDFG) helps the Idaho Transportation Department (ITD) determine where wildlife mitigation could be placed within a highway project to protect the traveling public.

In the spring in 2019, ITD District 4 developed a collection tool using the Survey123 application by ESRI that minimized the collected data and maximized the ease of reporting by the end user. Within the first year, ITD District 4 has seen a 321% increase in reported WVC's. By putting data collection into the hands of our employees and making data collection simplistic, employees have responded enthusiastically. Overall this application has given us more accurate data and more data points. With better data accuracy and density, we will be able to allocate resources more efficiently to minimize WVC's.
9 AM
WebEx meeting

Wendy Terlizzi (ITD HQ Env Mgr)
Brent Brumfield (ITD District 4 GIS)
October 22, 2020

US Army Corps Walla Walla District and the Navigable Waters Protection Rule
Play Meeting Recording (1 hr. & 55 min. - WebEx)
Clean Water Act Section 401 Presentation
Walla Walla District liaison, Shane Skaar, will provide a brief training on the new rule that went into effect in June.
US EPA Region 10 and changes to Section 401 Water Quality Certification process
8:30 AM
WebEx meeting

Speakers: Shane Skaar, Walla Walla District ITD Liaison
Linda Storm, EPA
July 23, 2020ITD/SHPO Disagreement Regarding Project Effects to Historic Highway & Favorable ACHP Comment
Play Meeting Recording (52 min. - WebEx)
The Federal Highway Administration (FHWA) Idaho Division Office and the Idaho Transportation Department requested to the Advisory Council on Historic Preservation (ACHP) to provide resolution of a dispute with the Idaho State Historic Preservation Office (Idaho SHPO) of the “Determination of Effect” finding for the construction of two additional lanes along a segment of United States Highway 93. Proposed project actions would create a four-lane roadway, divided by a median for 2.255 miles in Jerome County, Idaho. FHWA Idaho Division Office and ITD issued a “Determination of Effect” that project actions would constitute a “No Adverse Effect.” Idaho SHPO disagreed with the determination and had recommended an “Adverse Effect” finding.

As further consultation to resolve this disagreement with Idaho SHPO reached a stalemate, the FHWA Idaho Division Office requested the ACHP to review the finding and concur with the finding of No Adverse Effect to Historic Properties. We will discuss how we worked in coordination with FHWA, SHPO, our consultants, and the ACHP to attain a positive outcome.
8:30 AM
WebEx meeting

Speakers: Matt Kriegl & Marc Münch, ITD
May 28, 2020LHTAC presented on recent successes in partnering with the Forest Service to provide for FHWA-required mitigation
Play Meeting Recording (1 hr. & 26 min. - WebEx)
Problem: Needed to find faster and more cost effective mitigation for projects that are FHWA-only mitigation that did not leave our local sponsors with a long term burden.
Solution: Looked for regional partner with an already established environmental stewardship mission, that had a restoration project that created or restored wetlands that we could financially contribute to provide mitigation. Need willing and proactive partner, that owns the land or has a conservation easement on the land as well as a long term management plan.
WebEx only meetingSpeaker: Karissa Nelson (Hardy), LHTAC
March 26, 2020Cancelled
January 23, 2020ITD 654 Form and Instructions
Play Meeting Recording (1 hr. & 20 min. - WebEx)
8:30 AM
ITD HQ Auditorium
3311 W State St
Speaker: Aimee Hill, ITD
December 5, 2019ESA Section 7 Consultation and Mitigation
Presentation on consultation and compliance under the Endangered Species Act and Magnuson-Stevens Act. Focus was placed on projects that require working in and around rivers and other waterbodies, construction elements that have potential to affect listed species, and mitigation strategies. Also covered Worker Environmental Awareness Trainings (WEATs) in other states. WEATs help contractors minimize impacts to listed species, as well redd surveys, isolation of in-stream work areas, fish salvage and compliance monitoring.
8:30 AM
ITD HQ Auditorium
3311 W State St
Speaker: David Fornander, Jacobs
September 26, 2019I-84 Noise Mitigation and Desirability
The Idaho Transportation Department is making plans to widen Interstate 84 from Nampa to Caldwell. The presentation focused on some interesting aspects of obtaining a result on desirability per the noise policy.
11:00-12:30* time change
ITD HQ Auditorium
3311 W State St
Speaker: Kurt Wald, Horrocks Engineers
July 25, 2019 CEQ NEPA Legislative Update
The National Association of Environmental Professionals (NAEP) hosted its annual NEPA Policy and Legislative Update. The July 25th webinar provided current information on developments regarding the National Environmental Policy Act (NEPA).
11:00-12:30* time change
ITD HQ Auditorium
3311 W State St
Speaker: Ted Boling, CEQ
May 23, 2019Spanning Time: The History of the Broadway Bridge
Barbara Perry Bauer discussed the background and history of Boise River bridges, and the importance of the Broadway Bridge to Boise's development. The presentation was part of mitigation for the removal of an National Register of Historic Places eligible bridge constructed in 1956 and replaced with a new structure in 2017.
8:30 AM
ITD HQ Auditorium
3311 W State St
Speaker: Barbara Perry Bauer, TAG Historical Research & Consulting, Inc.
March 28, 2019US Army Corps of Engineers, Walla Walla District
New Wetland Delineation Guidance
ITD HQ Auditorium
3311 W State St
Presenter: Shane Skaar
January 24, 2019The Narrows | Presenter: Nathan Cleaver, Keller Associates
A presentation was given on the Environmental Assessment (EA) jointly prepared for two interrelated projects; Old Hwy 37 (The Narrows) and Rock Creek Restoration. Old Hwy 37 is a federal transportation project while Rock Creek Restoration is a US Forest Service project. The presentation discussed the evolution of the EA, differences between FHWA and USFS requirements, and issues and how they were overcome.
3311 W State St
Nathan Cleaver – Keller Associates
October 25, 2018US Army Corps of Engineers introduced the new ITD liaison and
discussed how to handle state-funded and “non-reporting” nationwide permits.

ITD Office of Communications discussed the Public Outreach Planner (POP)
and how to apply this tool to projects.
3311 W State St
Tracy Peak – US Army Corps of Engineers
Adam Rush – ITD Communications
August 23, 2018Land Use Planning Compatibility – airports and transportation
3311 W State St
Presented by Joe Guenther, T-O Engineers


For the following forms go to ITD’s Form Finder web page.
Use the numbers below to search and download the current ITD Form.

  • ITD 649 Categorical Exclusion Determination Form & Instructions
  • ITD 654 Environmental Evaluation Form & Instructions

To learn more about the Environmental Process or for specific questions, please go to the ITD Environmental Process Manual.

There are more than 40 federal and state environmental laws that affect transportation decisions. A unifying federal environmental law is the National Environmental Policy Act of 1969 (NEPA), which provides a framework for addressing the various environmental statutes, regulation and policies. NEPA is a procedural statute (40 CFR sec 1500) for decision-making during federal projects to assure analysis of social, economic and ecological impacts. ITD is required to provide a NEPA document for projects that are federally funded through the Federal Highway Administration (FHWA).NEPA Process includes social impacts, ecological impacts, transportation needs, public input & economic impacts

NEPA Requirements

  • Study a reasonable range of alternatives based on “Purpose and Need”
  • Use a systematic, interdisciplinary approach while evaluating environmental factors during the planning process
  • Widespread interagency coordination, review, and consultation
  • Documentation of the environmental analysis process in plain language
  • Provide the public opportunity to participate and comment throughout the process

Three Types of NEPA Documents

Environmental Evaluation (EE) | Categorical Exclusion (CE)Environmental Assessment (EA)Environmental Impact Statement (EIS)
Document approval in-house or by FHWADocument approved by FHWADocument approved by FHWA
Examination of project concept and location regarding potential
for socioeconomic or ecological impacts
Unsure if significant impactsSignificant impacts
Determination of impact significanceEvaluation of key resourcesMore detailed evaluation
Finding of No Significant Impact (FONSI)Record of Decision (ROD)

Programmatic Agreement between ITD and FHWA Idaho Division Office
Approval of Actions Classified as Categorical Exclusions for Federal-Aid Projects

FHWA Links

ITD Environmental Links



Cultural resources are the physical evidence or place of past human activity. They can include everything from archaeological sites to buildings, bridges, and canals to landscapes and places of traditional religious and cultural importance. ITD seeks to avoid, minimize, or mitigate adverse impacts to historically significant cultural resources. The ITD Cultural Resources Program ensures all ITD projects are in compliance with state and federal cultural resource protection laws.

ITD projects with federal funding, permitting, or land are required by Section 106 of the National Historic Preservation Act of 1966, and implementing regulations 36 CFR 800 to take into account the effects of project actions on historic properties. During this process ITD Cultural Resources staff define the Area of Potential Effect, make a good and reasonable faith effort to identify historic properties within that area, and assess any potential effects of the project on those properties. This process is completed in consultation with the Idaho State Historic Preservation Officer (SHPO), Tribal Historic Preservation Officers (THPO), Native American Tribes, local historic preservation commissions, and other interested parties.

For more information on the ITD Section 106 process, please refer to the Cultural Resources chapter of the Environmental Procedures Manual.

Those ITD projects with funding or approval from the Federal Highway Administration must also meet requirements of Section 4(f) of the Department of Transportation Act of 1966. Please see the Section 4(f) chapter of the Environmental Procedures Manual for more information on this process.

Archaeological DigArchaeology is the study of past human activity through the recovery and analysis of material culture. The archaeological record consists of artifacts, ecofacts, features, and cultural landscapes which have been used by people of the pasts.

Archaeologists precisely record where all the clues of the past are found so they may reconstruct living surfaces, which may include house remains, fire-hearths, and refuse or garbage pits. Once the artifacts and their contexts are fully studied, researchers attempt to explain how past peoples and societies made a living and adjusted to changing social and environmental circumstances. Here are some examples of archaeological resources that ITD projects might encounter:

  • Artifacts: stone tools, bone, ceramics, glass, and metals
  • Ecofacts: animal bones, charcoal, plants, and pollen
  • Features: fire hearths, refuse areas/trash dumps, rock art

Historical Coin
Once an archaeological site has been identified, archaeologists use the National Register of Historic Places criteria to determine if it the property has historic significance and can still convey it. Archaeologists determine if the property is associated with an important historic event or if it can yield more information about the past. Archaeologists complete a detailed recording of the site, document the site using photography and sketch maps, and conduct in-depth analysis of any artifacts, ecofacts, and features that are present to better understand how these were used by people of the past. ITD uses archaeologists to document sites that might be impacted by projects, determine if they have significance, and assess what impacts project actions might have on those properties.

Society for Historical Archaeology (SHA): ITD receives the Award of Merit for the Sandpoint Archaeology Project

Historical CanalHistorical BarnArchitectural history is the study of the built environment and how surroundings can impact our lives. Certain properties remind us of our history and shared past. Here are some examples of architectural resources that ITD projects might encounter:

  • Buildings: private residences, commercial properties, barns, schools, and courthouses
  • Structures: bridges, roads, and irrigation canals
  • Objects: monuments and boundary markers
  • Sites: parks and cemeteries
  • Districts: downtown Main Streets and residential neighborhoods

Once an architectural resource has been identified, architectural historians use the National Register of Historic Places criteria to determine if it the property has historic significance and still has the physical features necessary to convey that significance. Rainbow BridgeUsually these properties are at least fifty years old. Architectural historians determine if the property is associated with an important historic event or person; has a distinctive design, style, or construction; or if it can yield more information on the past. They also ask if the location, design, setting, materials, workmanship, association, and feeling of the property helps that property convey its significance to the general public. Architectural historians complete detailed written descriptions of the property, document the property using photography and sketch maps, and conduct in-depth archival research to better understand the local, state, or national significance of the property. ITD employs architectural historians to document properties that might be impacted by projects, determine if they have significance, and assess what impacts project actions might have on those properties.

In 2008, ITD was awarded the Excellence in Historic Preservation award from Preservation Idaho for their work on the Idaho 55 Rainbow Bridge.

Historic Survey of Roads in Idaho’s State Highway System

This multi-volume publication illuminates the history and evolution of Idaho’s highway transportation network. These volumes have been developed as a way for the public and consultants to better understand the history surrounding Idaho’s state highway network, the individual highways, and to provide a consistent interpretation in applying National Register of Historic Places (NRHP) criteria to evaluate the significance, integrity, and eligibility of the current roads within this road system.

Volume 1 is the Historic Context and Volume 2 is the Application of the National Register of Historic Places Criteria for Evaluation. Volume 3, currently in development, will document individual highways and their specific history and assess their NRHP eligibility.

Idaho is a geographically, economically, and culturally diverse state. Our transportation system represents the shared history that helps to unite us. ITD has worked with consultants and local communities to prepare informative publications and resources about transportation history in the Gem State.

  • The Weiser River Trail: To the Golden Heart of Idaho – This pamphlet summarizes the history of the Pacific and Idaho Northern Railroad and Weiser River Trail, Idaho’s Longest Rail-Trail, located in Adams and Washington Counties.
  • Blaine County Transportation: A History of Bridges and Roadways in Blaine County, Idaho – This document identifies historic vehicular bridges in Blaine County and how these resources relate to the historic transportation infrastructure in the central Idaho.
  • Marsing Oral History Project | “No Bridge, No Town” – Oral Histories on the Historic Snake River Bridge and the Town of Marsing: Agreed upon as an appropriate mitigation for the adverse effect to the historic Snake River Bridge near Marsing, Idaho, these interviews were conducted by the Owyhee County Historic Preservation Commission to preserve both the history of the bridge and life in early twentieth century Marsing.
  • Idaho Transportation Photo Collection: This collection of over 30,000 images documents the rich history of transportation and infrastructure development in Idaho. The online, searchable database is free to the public.
  • Idaho’s Highway History 1863-1975: Written in 1985 this document provides a brief synopsis of transportation in Idaho, including the history of the Idaho Transportation Department.
  • The Other Side of Sandpoint – Early History and Archaeology Beside the Tracks: The Sandpoint Archaeology Project (2006-2013) was one of the largest historic archaeology projects in the western United States, and the largest archaeology project ever completed in the state of Idaho. It resulted in the recovery of over 600,000 artifacts associated with the early history of Sandpoint, Bonner County, Idaho. The four volumes include:
      1) Sandpoint Stories
      2) Material Culture of Everyday Life
      3) The Ethnography and Prehistory of Sandpoint (upon request), and
      4) Summary of Methods and Data.
  • Research Guide on Snake River Ferries: This document captures the history of ferry crossings and pioneer travel throughout Idaho’s Snake River region, including links to additional research materials on ferry crossings.
  • US-95, Meadows Valley Transportation Corridor: Learn about the history of transportation routes and modes connecting Meadows Valley to Riggins.
  • Steel Bridges in Eastern Idaho: Once commonplace but now rare, steel bridges in eastern Idaho heavily influenced the development and settlement of the region.
  • History of Grace Dam Power Plant: One of three hydroelectric power plants in Caribou County, the Grace Dam Complex – including the dam, power plants, and penstocks – was built in 1906 and is still operational today, providing power to southern Idaho and northern Utah.
  • From Forest to Field – Agriculture in Bonner County: Developed as mitigation for the adverse effect to a farmstead, this document is a detailed look at the agricultural industry in Bonner County. Visit the Bonner County History Museum to see this material on exhibit.

ITD has worked with local communities and historians to develop and install interpretative panels throughout the state.

Here are some interpretive signs you can see during your travels.

Human & Physical Environment

Air Quality impacts are evaluated for all Idaho Transportation Department (ITD) federally funded transportation projects to determine if the project will cause or contribute to a violation of National Ambient Air Quality Standards. ITD’s mission is to improve air quality by ensuring all ITD projects and operations comply with federal, state and local air quality laws and regulations, and by promoting strategies which reduce emissions of motor vehicle pollutants.

ITD Air Screening Policy (Nov/Dec 2007)

 I-84 at Eagle Interchange
I-84 at Eagle Interchange

Links to Regulations and Guidance:

Idaho DEQ pages:

The Idaho Transportation Department must conduct hazardous materials investigations for any property ITD owns, manages, plans to sell, or plans to purchase. If hazardous materials are found to be present on ITD property, federal and state environmental laws requires ITD to cleanup and properly dispose of all hazardous materials regardless of whether the original source is from ITD activities, from a tenant, or inherited when property is acquired.

ITD seeks to identify hazardous materials early in the project development process through thorough investigations to reduce liability and to minimize delays. Advantages to this identification process include:

  • Minimizing potential dangers to ITD and other personnel
  • Protecting the environment from exposure to or spread of hazardous materials
  • Minimize design and construction costs due to potential project delay or termination
  • Reduce adverse publicity

Storage Tank – I-84 Connector Project

Abandoned Drums – Nampa, ID

HazMat Investigations are conducted in the following steps:

Administrative Review – (Required on all projects with the exception of Tier I Minor Projects)

  • Use the Terradex Idaho site to conduct a project area “radius search”, with the search radii below in mind (a 1-mile radius is recommended).
    • This is intended as a review of published lists to determine if there are any documented HazMat sites, underground storage tanks or contaminated groundwater within or adjacent to the project area.
List NameAbbreviationSearch RadiusAgency Contact
National Priorities List (Superfund) NPL 1 mileEPA
Comprehensive Environmental Response, Compensation, and Liability Information SystemCERCLIS½ mileEPA
CERCLIS No Further Remedial Action PlannedCERC-NFRAP½ mileEPA
Corrective Actions on Resource Conservation and Recovery Act Information Treatment, Storage and Disposal SitesCORRACTS RCRA-TSD
1 mileEPA
Corrective Actions on Resource Conservation and Recovery Act Information Non-Treatment Storage and Disposal CORRACTS RCRA non-TSD½ mileEPA
RCRA GeneratorsRCRAW/in or adj to ROW[1]EPA
Emergency Response Notification SystemERNSROW onlyEPA
Solid Waste Management Facilities/Landfill FacilitiesSWF/LF½ mileHealth Dept
Underground Storage TankUSTW/in or adj to ROWDEQ
Leaking Underground Storage TankLUST½ mileDEQ
Other1 mileDEQ
  • Review the topography, groundwater levels and flows in the project area.
  • Determine whether the site conditions warrant further investigation.
  • Where warranted, the appropriate resource agencies are contacted (contact information is provided on the Terradex map at each site)
  • If there is a potential risk, a Phase I or Phase 2 must be completed

Initial Site Assessment – (Phase I)

  • Determines whether there is a potential HazMat risk
  • Complete a Records Review of maps and historic documents to obtain information to help identify hazardous environmental conditions
  • Perform a Site Reconnaissance to inspect property and any structures on the project for recognized hazardous environmental conditions
  • Conduct Interviews with property owners or site managers to obtain information about possible hazardous environmental conditions that confirms information previously obtained or identifies new information

Preliminary Site Investigation – (Phase II)

  • Confirm whether HazMat is present and extent of contamination
  • Soil and water samples taken and analyzed
  • Reports written to discuss physical environment and its relationship to potential contamination, sampling techniques, analysis results, health and safety considerations, identification of any contamination if found, conclusions, and remediation strategy and costs

Detailed Site Investigation – (Phase III)

  • Conducted when existence of HazMat on the project site is confirmed
  • Includes the Site Investigation, Remedial Action Plan and remediation
  • Approximate clean up time can vary from 6 months to several years
  • Authorization of a Phase III investigation will be coordinated through the Headquarters Environmental Section Manager

Additional information can be found under “1400 Hazardous Materials” in the ITD Environmental Process Manual

Tank Oil Spill – North of Smith Ferry, ID

Traffic Noise is increased by heavier traffic volumes, higher speeds and a greater percentage of trucks. ITD environmental studies involving major highway improvements must analyze existing noise levels and predict future noise levels to determine noise impacts. All traffic noise studies prepared for ITD projects must adhere to procedures and requirements as established by federal law, Federal Highway Administration (FHWA) regulations, and ITD noise analysis guidelines.

Noise Forms

Additional information concerning the Noise Policy can be found under “1300 Noise” in the Environmental Process Manual

Noise Barrier / Sound Walls along I-84
Noise Barrier / Sound Walls along State Highway 55


Natural Environment

Water of the U.S., Wetlands, Floodplains and Floodways, Wild and Scenic Rivers and Sole Source Aquifers

Wetlands – Section 404 of the Clean Water Act

Wetlands generally include swamps, marshes, bogs, and similar areas that are saturated by surface or groundwater and supports vegetation adapted for life in saturated conditions. They provide important functions including groundwater recharge, erosion control, shoreline stabilization, and fish and wildlife food and habitat.

Two Categories of Wetlands:

  • Jurisdictional wetlands contain surface waters that have a connection to “Waters of the US”
  • Non-Jurisdictional wetlands do not have a connection to “Waters of the US”

ITD’s policy is to avoid any activities that adversely affect wetlands during the design, construction, and maintenance of transportation projects. Appropriate action is taken to minimize and mitigate impacts that cannot be avoided.

Section 404 Permit – Required for discharging, dredging, or placing fill material within “Waters of the US” including wetlands to prevent quality degradation and overall loss of wetlands. Administered by the US Army Corps of Engineers (USACE).

Link to Regulations

Links to Guidance:

US Army Corp of Engineers (USACE) / Walla Walla District Information:

Link to FHWA Site:

Sole Source Aquifer

Threatened and Endangered Species (ESA), Essential Fish Habitat (EFH), Idaho Species of Greatest Conservation Need (SGCN), Migratory Birds, Wildlife Connectivity

The Biological program examines highway impacts on species listed under the Federal Endangered Species Act (ESA) and works with the Idaho Fish and Game, Fish and Wildlife Service (USFWS), Forest Service, Bureau of Land Management, and others for the purpose of preserving, protecting, and enhancing the state’s natural resources while operating, maintaining, and improving the state’s transportation system.

  • For more information, see “Wildlife” tab above.

Threatened and Endangered Species (ESA)

Biological AssessmentProgrammatic Biological Assessment (PBA)PBA Forms
Biological Resources Personnel QualificationsProgrammatic Biological Assessment (2022)
PBA Appendices (2022)
PBA Biological Opinion U.S. National Marine Fisheries Service (2022)
PBA Biological Opinion U.S. Fish & Wildlife Service (2022)
PBA Commitments Crosswalk Table
Go to ITD’s Form Finder web page – Use the numbers below to search & download the current ITD form(s).
• ITD-289 form – PBA Pre-Notification
• ITD-290 form – PBA Construction Monitoring

More information to come for:

Idaho Species of Greatest Conservation Need (SGCN) and Migratory Birds


Memos & Standard Operating Procedures (SOPs)

Outside Agency Contacts

Planning & Public Involvement
To manage public outreach plans & activities, ITD staff need information, resources & recommended tools to implement & conduct an effective public outreach effort.


Temporary and Construction Site Best Management Practices
Chapter 1 – Erosion Control Best Management Practices (entire chapter)


Chapter 1 Introduction
Chapter 1 Matrix
EC-1 Scheduling-Sequencing of Construction Activities
EC-2 Preservation of Existing-Natural Vegetation
EC-3 Coffer Dam
EC-4 Diversion Channels-Ditches
EC-5 Slope Drains
EC-6 Hydraulic Mulch
EC-7 Hydroseeding
EC-8 Soil Binders
EC-9 Straw Mulch
EC-10 Wood Mulching
EC-11 Geotextiles, Plastic Covers & Erosion Control Blankets-Mats
EC-12 Vegetation-Seeding
EC-13 Dust Control
EC-14 Wind Erosion Control
EC-15 Snow Management
Chapter 2 – Sediment Control Best Management Practices (entire chapter)


Chapter 2 Introduction
Chapter 2 Matrix
SC-1 Dikes and Berms
SC-2 Check Dam
SC-3 Gravel Bag Berms
SC-4 Street Sweeping and Vacuuming
SC-5 Sandbag Barrier
SC-6 Inlet-Outlet Protection
SC-7 Silt Fence
SC-8 Fiber Rolls
SC-9 Sediment-Desilting Basin
SC-10 Sediment Trap
SC-11 Temporary Construction Entrance
SC-12 Temporary Roads
SC-13 Entrance-Outlet Tire Wash
Chapter 3 – Non-Stormwater Best Management Practices (entire chapter)


Chapter 3 Introduction
Chapter 3 Matrix
NS-1 Water Conservation Practices
NS-2 Dewatering Operations
NS-3 Paving and Grinding Operations
NS-4 Temporary Stream Crossing
NS-5 Clear Water Diversion
NS-6 Illicit Connection or Discharge
NS-7 Potable Water-Irrigation
NS-8 Vehicle and Equipment Cleaning
NS-9 Vehicle and Equipment Fueling
NS-10 Vehicle and Equipment Maintenance
NS-11 Pile Driving Operations
NS-12 Concrete Curing
NS-13 Material and Equipment Use Over Water
NS-14 Concrete Finishing
NS-15 Structure Demolition-Removal Over or Adjacent to Water
NS-16 Freeze Reduction
Chapter 4 – Waste Management Best Management Practices (entire chapter)


Chapter 4 Introduction
Chapter 4 Matrix
WM-1 Staging and Materials Site Management
WM-2 Material Delivery and Storage
WM-3 Material Use
WM-4 Stockpile Management
WM-5 Spill Prevention and Control
WM-6 Solid Waste Management
WM-7 Hazardous Waste Management
WM-8 Contaminated Soil Management
WM-9 Concrete Waste Management
WM-10 Sanitary-Septic Waste Management
WM-11 Liquid Waste Management
WM-12 Fertilizer Storage and Discharge Mangement
Permanent and Post-Construction Best Management Practices
Chapter 5 – Post Construction Best Management Practices (entire chapter)


Chapter 5 Introduction
PC-1 Channel Protection-Check Dams
PC-2 Sheet Flow to Buffers
PC-3 Channel Protection-Flexible Channel Liners
PC-4 Channel Protection-Rigid Channel Liners
PC-5 Dikes and Berms
PC-6 Dry Swale
PC-7 Wet Swale
PC-8 Geosynthetics
PC-9 Surface Sand Filter
PC-10 Subsurface Sand Filter
PC-11 Perimeter Sand Filter
PC-12 Organic Filter
PC-13 Pocket Sand Filter
PC-14 Bioretention
PC-15 Inlet-Outlet Protection
PC-16 Interceptor Ditches
PC-17 Retaining Walls
PC-18 Stormwater Basins
PC-19 Extended Detention Basin with Micropool
PC-20 Wet Basin
PC-21 Wet Extended Detention Basin
PC-22 Shallow Wetland
PC-23 Extended Detention Shallow Wetland
PC-24 Pond-Wetland System
PC-25 Pocket Wetland
PC-26 Sediment Control Box
PC-27 Infiltration Trench
PC-28 Infiltration Basin
PC-29 Slope Drains-Chutes-Flumes
PC-30 Rock Armor-Rock Mulch-Turf Reinforced Mats
PC-31 Serrations and Roughening
PC-32 Terraces and Benches
PC-33 Topsoil Management
PC-34 Vegetation-Seeding
PC-35 Vegetation-Planting
PC-36 Water Quality Inlet Oil-Grit Separator
PC-37 Street Sweeping
PC-38 Deep Sump Catch Basin
PC-39 On-Line Storage in Storm Drain Network (Vaults)
PC-40 Porous Pavements
PC-41 Proprietary-Manufactured Systems
PC-42 Aggregate Armor
Chapter 6 – Glossary of Terms


BMP Manuals Updates/Changes
ITD Best Management Practice Manual Change Request Form



Stormwater means stormwater runoff, snow melt runoff, surface runoff and drainage. Stormwater runoff may pick up and transport sediment, oil, and other pollutants. If not managed properly these pollutants can affect the quality of surface waters making them unsafe for drinking, fishing, swimming, or other activities.

Clean Water Act (CWA)
In 1972, Congress passed the Federal Water Pollution Control Act Amendments “to restore and maintain the chemical, physical, and biological integrity” of the Nation’s waters. The Clean Water Act (CWA) is a 1977 amendment to the Federal Water Pollution Control Act of 1972. The CWA set the basic structure for regulating discharges of pollutants to waters of the U.S.

National Pollution Discharge Elimination System (NPDES)
The NPDES permit program was introduced in 1972 and regulates discharges to “waters of the U.S.” Any discharge from a “point source” into a “waters of the U.S.” must have an NPDES permit. Stormwater discharges are regulated by NPDES permits. NPDES permits contains limits on allowed discharges, monitoring and reporting requirements, and other provisions to ensure that discharges do not harm water quality or public health. See EPA website for additional information

Idaho Transportation Division of Highways (ITD) has coverage under three different types of NPDES permits, including:

  • Construction General Permit (CGP) – Construction activities that disturb greater than one acre of land and have the potential to discharge stormwater to a waters of the U.S.
  • Municipal Separate Storm Sewer Systems (MS4)- Stormwater drainage from roads or property that drain into stormwater conveyance systems owned by the state, a city, a town, a village, a public university, a public hospital, a military base, a correctional facility or other public entity that discharges to waters of the U.S.
  • Multi-Sector General Permit (MSGP)- Industrial activities that have the potential to discharge stormwater to a waters of the U.S., including sand and gravel mining. All EPA covered industrial activities are listed in Appendix D of the MSGP.

The following forms are located on ITD’s Form Finder web page.
Use the numbers below to search and download the current ITD Form.

Construction General Permit (CGP) Projects (SWPPP)
ITD-2784 Form – Stormwater Site Assessment (for Design)
ITD-2741 Form – Construction Stormwater Site Evaluation Worksheet
ITD-2950 Form – SWPPP Template: ITD-based Format

Stormwater Runoff Action Items Tool
Seasonal Dry Period and Frozen Conditions Guidance
Buffer Design Decision Flow Chart
Buffer Calculation Presentation
Buffer FAQs

Non-CGP Projects (PPP)

ITD-2788 Form – Plan Template

Contractor Notes (CN)
CN Winter Shutdown

Click to go to the ITD Form Finder

2018 Standard Specs Book

The following forms are located on ITD’s Form Finder web page.
Use the numbers below to search and download the current ITD Form.


ITD-2802 Form – Stormwater Compliance Inspection Form (CGP Projects)
ITD-2960 Form – LHTAC Transfer of SWPPP Inspection Responsibility
    • 2960 Instructions and Inspection Procedures
ITD-2790 Form – Notice of Potential Violation of CGP or Notice of Prohibited Discharge

SWPPP Management
SWPPP Management Process Overview
ITD-2950 Form- SWPPP Template, ITD-based Format
ITD-2951 Form – Contractor or Local Entity CGP Signature Authority
ITD-2952 Form – ITD Delegation of CGP Signature Authority
ITD-2953 Form – Corrective Action Reporting Tables
ITD-2954 Form – Subcontractor Certification of SWPPP
ITD-2955 Form – SWPPP Modification Log
ITD-2956 Form – Grading and Stabilization Activities Log
ITD-2957 Form – Signature Sheet (Modifications and/or Corrective Action Reports)
ITD-2958 Form – SWPPP Training Log
ITD-2961 Form – Contractor Request to File Notice of Termination

Non-CGP Projects (PPP)
ITD-2786 Form – Construction Site Inspection Report
ITD-2789 Form – Stormwater Document Change Request

Click to go to the ITD Form Finder

ITD projects with NPDES CGP coverage require an Inspector with current ITD Environmental Inspection Training and a Contractor representative inspector with current ITD-approved Water Pollution Control Manager Training.

Water Pollution Control Management Training (WPCM)
Course Length: 16 Hours
ITD requires all Contractors to designate a Water Pollution Control Manager (WPCM). The WPCM must attend an ITD certified 16 hour stormwater management training course. This course has been developed to align with the 2017 CGP. Offerings are available at the following link.

AGC WPCM Training:

NPDES Stormwater Inspector Requalification

If your ITD Inspector Qualification for the NPDES Stormwater was obtained under the 2012 EPA CGP through WPCM reciprocity, it was only valid through the length of the 2012 CGP as stated on the ITD Inspector certificate of completion. ITD is requiring all individuals who want to maintain their Inspector certification to receive training on the 2017 permit. To do so, an individual holding an existing WPCM certificate of completion may choose one of two options as explained in the NPDES Requalification document.

Consultants – Construction Engineering & Inspection – Stormwater Inspector

To certify, complete the ITD Construction Stormwater Management Training course – or – the Idaho Association of General Contractors (AGC) Water Pollution Control Management Training course (see above). Those who complete the AGC course must also submit an Inspector Qualification Registration Form-2905, found in the ITD’s Contract Administration (CA) Manual, Section 114, and a copy of their WPCM course completion certificate to:

Idaho Transportation Department
Attention: Training & Development
P. O. Box 7129
Boise, Idaho 83707-1129

ITD Stormwater Training

ITD Construction Stormwater Management Training
Course Length: 16 hours initial, 8 hours refresher
This course is the Stormwater Management training for Construction Engineers and their management and inspection staff, as well as maintenence staff.
ITD Designer Stormwater Training
Course Length: 16 hours
This course is the Stormwater Management training for Project Development, Design Engineers and their support staff.

Municipal Separate Storm Sewer Systems (MS4) Permits
In some cases ITD is listed as a co-permittee with local municipalities that share or are connected to the same MS4 conveyance system.

Annual MS4 Permit Reports
Annual reporting is required for MS4 permit holders.

Phase II – District 1

Municipal Separate Storm Sewer Systems (MS4) Permits
In some cases ITD is listed as a co-permittee with local municipalities that share or are connected to the same MS4 conveyance system.

Annual MS4 Permit Reports
Annual reporting is required for MS4 permit holders.

Phase II – District 2

ITD Phase I and Phase II MS4 – For complaints please call: 208-334-8300

What to do with household hazardous waste? Learn more at Household Hazardous Waste | City of Boise

Phase I – District 3

Municipal Separate Storm Sewer Systems (MS4) Permits
In some cases ITD is listed as a co-permittee with local municipalities that share or are connected to the same MS4 conveyance system. ITD District 3 is a partner of the Partners for Clean Water group with local MS4 co-permittees. | Partners for Clean Water

If you’d like to speak to someone, you can call the Stormwater Pollution Prevention hotline at 208-395-8888. | Partners for Clean Water – Report an Issue

Annual MS4 Permit Reports
Annual reporting is required for MS4 permit holders.

Phase II – District 3

Annual MS4 Permit Reports
Annual reporting is required for MS4 permit holders.

Other Permittees in the NPDES MS4 Phase II Area

Municipal Separate Storm Sewer Systems (MS4) Permits
In some cases ITD is listed as a co-permittee with local municipalities that share or are connected to the same MS4 conveyance system.

District 5: Permit no. IDS-028053

Annual MS4 Permit Reports
Annual reporting is required for MS4 permit holders.

Phase II – District 5
2022-2023 Annual Report
2019-2020 Annual Report
2017-2018 Annual Report
2016-2017 Annual Report
2015-2016 Annual Report
2014-2015 Annual Report
2013-2014 Annual Report
2012-2013 Annual Report
2011-2012 Annual Report
2010-2011 Annual Report
2009-2010 Annual Report
2008-2009 Annual Report
2007-2008 Annual Report
2006-2007 Annual Report

Municipal Separate Storm Sewer Systems (MS4) Permits
In some cases ITD is listed as a co-permittee with local municipalities that share or are connected to the same MS4 conveyance system.

Annual MS4 Permit Reports
Annual reporting is required for MS4 permit holders.

Phase II – District 6

2022-2023 Annual Report
2021-2022 Annual Report
2020-2021 Annual Report
2019-2020 Annual Report
2018-2019 Annual Report
2017-2018 Annual Report
2016-2017 Annual Report
2015-2016 Annual Report
2014-2015 Annual Report
2013-2014 Annual Report
2012-2013 Annual Report
2011-2012 Annual Report
2010-2011 Annual Report
2009-2010 Annual Report
2008-2009 Annual Report


Idaho is home to finned and furred animals that make the state a sought-after place to live and visit. Like humans, wildlife also travel and traverse across highways in search of food, better habitat, or mates, which can result in significant concerns for public safety. Each year there are an average of 1,010 crashes involving wildlife on highways and interstates. These crashes can result in the mortality of wildlife as well as human fatalities. Some years no human fatalities are recorded; however, most years between one and four people are killed as a result of a wildlife-vehicle collision.

Herd of elk approaching I-15
Herd of elk approaching I-15

ITD develops projects and works with agency partners like the Idaho Department of Fish and Game (IDFG) to reduce risk. Wildlife mitigation for that risk is often required through environmental processes during project development.

SH-21 Cervidae Wildlife Overpass
SH-21 Cervidae Peak Wildlife Overpass
Wildlife crossings like underpasses or overpasses can drastically reduce the risk of wildlife-vehicle collisions when planned and positioned appropriately.

The type of crossing structure depends on a number of factors. The department works with IDFG to analyze data including roadkill or carcasses, crashes, traffic volumes, migration and movement routes and more. Once a need is established, the agencies coordinate on what type of crossing is appropriate; some larger animals, like elk, are more comfortable using overpasses than underpasses.

ITD also identifies infrastructure that restricts the movement of fish. Steep or undersized culverts can prevent fish from moving upstream to access spawning habitat, find food or escape predation or stranding.

Funding for wildlife crossings primarily comes from competitive federal grants; no dedicated state funding is available. Projects are primarily identified by staff at regional offices based on demonstrated need.

Highway infrastructure can inadvertently limit the movement of fish to access habitat to spawn, search for food, migrate or escape predation. Culverts can be too steep or too small, creating faster flows that make it difficult for fish to swim upstream; they can also be perched too high above the channel and prevent fish from moving upstream.

When planning projects to improve existing highways, ITD actively looks to remove these barriers, often by replacing culverts with bridges or modifying culvert designs.

The department has also pursued federal grant opportunities in the absence of dedicated state funding to construct improvements specific to fish passage without being paired with highway improvements. Several projects are currently scheduled to improve fish passage, primarily in the Lewiston region that has the most habitat and population of endangered steelhead and salmon.

Moose along the SH-36 route
Moose running along the SH-36 route
ITD has several projects planned or ongoing to make highways safer for humans and wildlife. Some of those projects include:

  • Ongoing construction on U.S. Highway 95 near McArthur Lake will replace a box culvert with a longer bridge with greater vertical clearance to allow wildlife to pass underneath the highway to access the wildlife refuge.
  • Also in North Idaho, IDFG received a grant in 2023 for $250,000 to work with the community in Osburn to transform an Interstate 90 overpass into a crossing for elk and other large animals. No date has been set yet for construction as plans must be completed and additional funding identified.
  • The department is seeking grant funding for an underpass on U.S. Highway 30, Rocky Point Wildlife Crossing, south of Montpelier and targeting construction in 2025 to prevent collisions with wildlife, primarily mule deer. About 100 mule deer are struck by vehicles every year as they cross from summer habitat in the Caribou Mountains to winter habitat in the Bear Lake Plateau.

A statewide study is underway to identify hotspots for wildlife-vehicle collisions and to then develop a list of prioritized areas of major concern on state highways and interstates. The study will help the department pursue federal funding for improvements and is expected to be finished in summer 2024.

Projects to reduce wildlife-vehicle collisions and improve habitat connectivity have been constructed in many locations statewide, including most recently on State Highway 21 near Lucky Peak State Park.

Big game began using the overpass as soon as it was constructed in late 2023 to safely pass over the highway without posing a threat to drivers. The project was funded by a $7.2 million federal grant and is expected to reduce wildlife-vehicle collisions by 80 percent.

SH-21 Cervidae Wildlife Overpass nears completion
SH-21 Cervidae Peak Wildlife Overpass nears completion in 2023

Wildlife crossings videos

See YouTube videos below about constructed projects that have proven to be successful functional crossings. These videos were made in conjunction with the Yellowstone to Yukon Conservation Initiative.