I-15 Environmental Study

I-15 Environmental Study

Project Facts

Key Number: 9000
Project Number: IM-0005(138)

The Idaho Transportation Department (ITD) is conducting an environmental study to evaluate interstate access and congestion issues in the northern Pocatello/Chubbuck area. Several concepts intended to enhance transportation efficiency and safety will be studied.

Project Purpose and Need

The purpose of the project is to provide transportation system solutions to improve present and future access to and from I-15 for the safe and efficient movement of people, goods and services, while relieving congestion at current access points along I-15 and I-86 as growth and development continues in the area.

The need for the project arises from limited access to the interstate for northbound and southbound motorists living north of I-86 and east/west of I-15 along with the planned commercial and residential growth east/west of I-15 and north of Chubbuck. Existing conditions have created congestion and safety concerns at current access points and future growth and development will only make the situation worse.

Project Background

Motorists living north of I-86 in the northeastern Pocatello and northern Chubbuck areas currently have limited access to I-15. Traffic congestion, delays and safety concerns at current interstate interchanges are anticipated to get worse as growth and development continues in those areas.

A Major Investment Study (MIS) completed in 1995 and the recently completed Yellowstone Corridor Plan recommended developing an additional interchange on I-15. Ten congestion-relief concepts were evaluated in the MIS, including improvements to the Pocatello Creek and Clark Street Interchanges. Improvements to the Pocatello Creek Interchange have already been completed. The Clark Street Interchange improvements are in the final design phase. The MIS also evaluated developing interchanges in the northern Pocatello/Chubbuck area.

Project Description

The I-15 Environmental Study is evaluating interchange options on I-15 roughly bounded on the south by the WYE, and on the north by 2 ½ Mile Road. The study area may include connecting roads and ramps at proposed interchange locations. As a requirement, local options not using I-15 are also being considered.

What's Happened So Far

Project officials met with the Bannock Planning Organization (BPO) Transportation Advisory Committee* and the Local Agency Input Group** in the summer of 2004 to identify issues that should be addressed in the study. Project engineers then analyzed 17 potential build concepts. Project officials then conducted a preliminary screening analysis. Concepts carried forward were those that best met transportation needs and addressed the issues identified. A No Build alternative is always included. (See inside of brochure for concepts.)

*The BPO Transportation Advisory Committee includes representatives from the City of Chubbuck, the City of Pocatello, Idaho State University and the Bannock Planning Organization.

**The Local Agency Input Group includes representatives from the City of Chubbuck, the City of Pocatello, the Shoshone-Bannock Tribe, the Bannock Planning Organization and the Bannock County Commissioners.

Level 1 Screening (Preliminary) Project officials met with the Bannock Planning Organization (BPO) Transportation Advisory Committee and the Local Agency Input Group in the summer of 2004 to identify issues that should be addressed in the study. Project engineers investigated 17 potential “Build” Concepts. A preliminary screening analysis was conducted on the concepts. The “No Build” Concept and five “Build” Concepts that best met transportation needs were carried into the Level 2 Screening Process.

Level 2 Screening (2005 - Current) A Public Open House Meeting was held April 4, 2005 at Tyhee Elementary School in Chubbuck. The public was asked to provide input and identify project issues that needed to be addressed. The meeting was attended by 169 people who provided 50 written comments regarding the five “Build” Concepts carried forward from the Level 1 Screening.

A second Public Open House Meeting was held June 27, 2006 at the Portneuf District Library, in Chubbuck. The purpose of the meeting was to gather public input on the project’s Purpose and Need Statement, which alternative(s) should be carried forward in the environmental process and to identify any issues that may change the results of the Level 2 Screening Report. The meeting was attended by 52 people who provided 26 written comments on the project. The comments will help ITD narrow the number of comments carried forward in the environmental analysis and move toward selecting an alternative. Level 2 Screening (2005 - Current) documents:

Issues Identified

• Limited access to I-15 north of the I-86/I-15 system interchange
• Existing access to I-15 north of the I-86/I-15 interchange requires out of direction travel which contributes to congestion on U.S. 91.
• The crash rates are higher than state averages along U.S. 91 between I-86 and Reservation Road.
• Long-range planning predicts that existing interstate access points will not accommodate current or projected growth.

The following five concepts and the No Build concept were retained for further study

• Chubbuck Road NW Quadrant Partial cloverleaf
• 2 ½ Mile Road Interchange South of Existing 2 ½ Mile Road Overpass with Connection to Tyhee Road
• Tyhee Road Interchange
• Siphon Road Interchange Southern Alignment
• Chubbuck Road Interchange Northbound and southbound CD lanes

Make Comments

The Idaho Transportation Department values your input. Submit written comments using one of the forms below or contact for more information.
• Email Us please include your name and address
• Download a comment form (word doc)

Contacts

Mark Snyder, Project Manager ITD District 5
(208) 239-3336
mark.snyder@itd.idaho.gov

Compliance with Title VI of the Civil Rights Act

The Idaho Transportation Department (ITD) is committed to compliance with Title VI of the Civil Rights Act of 1964 and all related regulations and directives. ITD assures that no person shall on the grounds of race, color, national origin, gender, age, or disability be excluded from participation in, be denied the benefits of, or be otherwise subjected to discrimination under any ITD service, program, or activity. The department also assures that every effort will be made to prevent discrimination through the impacts of its programs, policies, and activities on minority and low-income populations. In addition, the department will take reasonable steps to provide meaningful access to services for persons with Limited English Proficiency.