Studying the US-95 and SH-8 corridors in Latah County.

US-95 Palouse Study

Studying the US-95 and SH-8 corridors in Latah County.


Overview

Studying two intersecting corridors, US-95 and SH-8, in Latah County.

June 2025 Public Meeting Summary

The June 2025 public meeting summary is now available. Responses to frequently asked questions are included in the summary document and the Frequently Asked Questions section of this site.

US-95 Palouse Region Study Icon

The Idaho Transportation Department initiated the US-95 Palouse Region Study to help determine investments on US-95 between Snow Road and the Latah/Benewah county line to improve safety, mobility, and economic opportunity in the region.


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Overview

Current traffic volumes coupled with predicted growth in the area prompted the need for the study to identify the current and future transportation needs and strategies to address them. 

The research completed as part of this study will help ITD better understand environmental considerations, community goals, and growth.

The study team will also analyze: 

  • Safety features
  • Congestion
  • Traffic operations
  • Multi-modal connections (walking and biking)
  • Travel time

Using stakeholder feedback and engineering data, the study team will develop, evaluate, and screen potential solutions to meet the needs of the area. These efforts will aid ITD in identifying projects and priorities that can more effectively be advanced into further engineering and National Environmental Policy Act (NEPA) requirements.

Map of study area on US-95 ranging from the Benewah County line to Snow Road to the south of Moscow.


Schedule

The PEL process is just the first step of many phases. Only the PEL phase is currently funded, and timelines may update.

A schedule of the Planning and Environmental Linkages (PEL) Study & Implementation Plan ranging from 2023 - 2027.

Community Engagement

Picture of attendees at a public meeting US-95 Palouse Study.

Public and stakeholder involvement are an important part of the decision-making process and success of this study. ITD has organized a technical advisory committee and community working group to provide input throughout the process. These partners include representatives from emergency services, education, commerce, community service organizations, tribal members, and government agencies.

At key study milestones, ITD will invite the public to provide input on potential design concepts and evaluation criteria and ask questions. This public input, along with technical information and engineering best-practices, help shape community-appropriate solutions.

To learn more about opportunities for input, or if you have questions, please email info@us95sh8.com


Public Meetings

Two public meetings have been held since the study was initiated. For more details, visit the Downloads and Resources below.

April 2024 Public Meeting: The public was invited to share their concerns about transportation problems and ideas for potential solutions. Meetings were held in Troy, Potlatch, Moscow, and online. The most frequently mentioned themes included:

June 2025 Public Meeting: ITD hosted an event in Moscow and online to gather input on the first round of preliminary design concepts and early evaluation results, in addition to evaluation criteria for the next phase of concept screening. Frequently mentioned themes included:

Visibility and sight distance

Sharp curves and turns

Intersection types

Lane and shoulder widths

Turn lanes:

  • Viola Junction
  • Estes Rd
  • Potlatch Junction
  • Others north of Moscow

Passing lanes:

  • Potlatch
  • Steakhouse Hill (Moscow Mountain)
  • Others north of Moscow

Traffic congestion and signage

Comments or information on specific locations, including Washington options

Support or concerns:

  • Specific locations were given including Washington options
  • More comments mentioned and supported western concepts than eastern concepts

Urban Mobility Concepts:

  • A Street
  • Palouse River Drive

Preference for an alternative route, including suggestions for:

  • East of Moscow
  • West of Moscow
  • North of Moscow
  • South of Moscow

Dislike for alternative routes

Turn and Passing Lanes, including Phillips Farm

Pedestrian Improvements, including Gritman Hospital Crossing

Traffic Signals

Walking and biking

Crosswalks

Cost

Environmental Considerations, including farmland and farmers

Study Details

Vision and Purpose & Need

Purpose & Need Statements are established prior to the development of concepts to clarify the expected outcome of the proposed action. They are used as a baseline to develop, evaluate, and eliminate concepts and guide the decision-making process.

The team gathered public and agency input to develop the following Vision and Purpose & Need statements for this study.

Vision: ​​To determine purposeful investments in the transportation network to improve safety and mobility and serve the communities and regional economic needs. 

Purpose: Why improvements are being proposed and the desired transportation outcomes
The purpose of the transportation improvements on US-95 between Snow Road and the Latah/Benewah county line is to enhance quality of life through transportation by: 

  • Reducing congestion through improved travel time reliability
  • Continuing to enhance a regional north-south connection between Lewiston and Coeur d’Alene as an important element of local and regional commerce
  • Accommodating walking and biking where appropriate on the U.S. highway system
  • Promoting safety by addressing geometric and operational deficiencies

Need: Transportation needs to be addressed and the underlying causes of the problems
The need for transportation improvements on US-95 between Snow Road and the Latah/Benewah county line includes:​

Geometric and operational deficiencies on the US-95 corridor, including deficiencies associated with horizontal and vertical curves, substandard grades, narrow shoulders, and passing opportunities

Current and future (2050) congestion

Inefficient movement of freight and through traffic on the one-way couplet due to the 25-mph design speed, on-street parking, and sharp turning radii at the intersections of SH-8 and US-95

Inadequate or lack of accommodation for travelers walking and biking to school, work, and shops

Concepts and Evaluation

The US-95 Palouse Region Study is following the Planning and Environmental Linkages (PEL) process, which includes several levels of screening to evaluate concepts that consider the transportation problems, operational context, and surrounding environment.

For this study, concepts range from broad to targeted, rural to urban. As we move through each step of the process, concept details will be refined. Multiple reasonable concepts may advance and will be called alternatives if they are recommended at the conclusion of the study. For information about the initial concepts and results from the first round of evaluation, please view the Level One Screening Results Pamphlet.

Considerations throughout development and screening funnel. A diagram that breaks out the levels for screening into a easy to follow graphic.
Concept Development and Evaluation Process

On-Alignment Concepts

Improvements would be considered for the current highway system. While the details of specific improvement elements would be refined throughout the process, we want to forecast what is possible for updates on the current roadway system.

Rural Improvements

  • Widening
  • Targeted roadway improvements outside Moscow city limits

Urban Improvements

  • Targeted roadway improvements in Moscow
  • Standalone improvements for walking and biking 

New Alignment Concepts

New connections and roadways would be considered off the current highway system. Because we build new roads to the latest design standards, many roadway elements would be determined by engineering best practices and technical data at the time of final design and construction.

New Corridors

  • New roadway corridors could be created to address the problems on US-95 and SH-8


New Routes for Urban Mobility

  • These concepts would help roadway users move around and through the Moscow area
Picture of West side concept routes and east side concept routes. The center of the picture shows the routes in pink with the corresponding numbers in the side columns.
Level One New Alignment Concept: New Alignments (see Screening Pamphlet for description and additional new alignment concepts)

Frequently Asked Questions

General Themes

PEL Process and Outreach

Downloads and Resources

Public Meeting #1 – April 2024

Public Meeting Summary (without map comments and roll plots)
Public Meeting Summary (only map comments and roll plots)
Online Meeting (archived)
Invitation Postcard

SH-8 PEL Study Materials:

Fact Sheet
Project Area Map

SH-8 Moscow to Troy Traffic Study

After reviewing crash data, potential new alignments, initial traffic analysis and public input, ITD has redefined the scope of the study needed on State Highway 8 from Moscow to Troy. At this time, the challenges and likely solutions to transportation issues on this highway are less robust than previously anticipated. The department will continue to pursue improving safety and traffic flow on SH-8 but will follow a more tailored process to determine those solutions.

This project will utilize all public input and efforts put into the PEL study up to this point and will identify solutions through a traffic study. This change will also shorten the timeline the study needs to be completed. ITD will continue to follow the PEL process for U.S. Highway 95 where traffic needs are greater and potential solutions more significant. 

What’s next for SH-8?

ITD will prepare a technical report by spring 2026 detailing potential solutions, which are expected to include smaller-scale improvements like passing lanes, turn lanes, and the previously presented realignments. These expected recommendations are more in line with engineering review and public comments that have been received to date. Once the report is complete, ITD will share with stakeholders via email and the project website. In the meantime, stay up to date on this separate study by visiting itdprojects.idaho.gov/pages/sh-8-moscow-to-troy-traffic-study

Picture of the intersection of US-95 and SH-8 by the diner in Moscow, Idaho.