Search studies

Find detailed reviews about specific areas of Washington’s transportation system in our collection of planning studies.

You might be looking for projects or local projects

Filter studies

Select
Select

34 results

I-5 Fort Lewis Weigh Station Study

Location: I-5
Timeline: August 2020 - June 2021
  • Complete
  • Thurston County
  • Pierce County

The Fort Lewis Weigh Station located along northbound Interstate 5 near DuPont in Pierce County is in need of updating. Freight traffic in the area experiences recurring congestion and delay due to high volumes from both freight and commuter traffic. The weigh station was built in 1969 and in

I-5 Operations and Demand Analysis

Location: I-5, SR 11, SR 539, SR 542
Timeline: July 2018 - September 2020
  • Complete
  • Whatcom County

The Northwest Region Mount Baker Area is leading this effort to address several mobility challenges along segments of the I-5 corridor within the urban area of Bellingham (MP 250 to MP 258). Congestion occurs regularly during peak travel at the I-5 interchanges and on the connecting regional

I-5 System Partnership

Location: I-5
Timeline: Ongoing
  • On hold

The I-5 System Partnership is a stakeholder group made up of representatives from transportation agencies, community organizations, the business community and jurisdictions throughout the 107-mile study area from Tumwater to Arlington. The group is dedicated to working collaboratively to review

I-5 Tumwater to Mounts Road Corridor Planning and Environmental Linkages Study

Location: I-5
Timeline: Spring 2020 - Spring 2022
  • Complete
  • Thurston County
  • Pierce County

The "Planning and Environmental Linkages Study" (PEL study) built upon the goals and strategies outlined in the original 2020 Corridor Study. This PEL Study represents a collaborative and integrated approach to transportation decision-making that:

  1. Considers environmental,

SR 105 West Harriman Street Signal - Roundabout Pre-Design Study

Location: SR 105
Timeline: January 2021 - May 2021
  • Complete
  • Grays Harbor County

The pre-design study looked at the signalized intersection on SR 105, South Boone Street, at West Harriman Street. The aging traffic signal at this intersection was last replaced in 1982 and is in need of replacement. The pre-design study conducted stakeholder and public outreach to examine

SR 142 - Safety and Accessibility Study

Location: SR 142
Timeline: 2019 - 2022
  • On hold
  • Klickitat County

Currently, pedestrian access along State Route 142 is limited for people who walk, bike or roll alongside the highway. With input from community members, elected officials and stakeholders, we will develop a plan to improve accessibility for all modes in the community of Klickitat. 

SR 16 - Tacoma Narrows Bridge to SR 3 Congestion Study

Location: SR 16
Timeline: November 2016 - December 2018
  • Complete
  • Kitsap County
  • Pierce County

The study identifies corridor strategies and solutions to address congestion and traffic operations along State Route 16 between the Tacoma Narrows Bridge and Gorst, as well as portions of SR 3 and SR 304 in Pierce and Kitsap counties. 

SR 160 Long Lake Road SE Planning Study

Location: SR 160
Timeline: Fall 2016 - Spring 2018
  • Complete
  • Kitsap County

A study was completed of SR 160 between Phillips Road and Mayvolt Road Southeast/Lake Valley Road Southeast in Kitsap County. The study identified intersection control strategies that have the potential to reduce the frequency and severity of crashes at the intersection of SR 160 (SE Sedgwick

SR 162 Sumner to Orting Corridor Planning Study

Location: SR 162
Timeline: Spring 2016 - Spring 2017
  • Complete
  • Pierce County

State Route 162 is an important north-south link through the Orting Valley community and the surrounding area of southeast Pierce County. The area experiences a high level of growth and development resulting in peak hour congestion that places demands on the highway system. The study identified

SR 166 Bay Street/Bethel Avenue/Maple Avenue Intersection Pre-Design Study

Location: SR 166
Timeline: December 2019 - June 2020
  • Complete
  • Kitsap County

A pre-design study was conducted at the intersection of SR 166 and Bay Street, Bethel Avenue and Maple Street in Port Orchard. The existing traffic signal at this intersection has reached the end of its useful life. This in-depth review included collaboration with local business owners, City of

SR 167 Master Plan

Location: SR 167
Timeline: The SR 167 Master Plan started in earnest in fall 2021 and we anticipate completing the SR 167 Master Plan update in 2023.
  • In progress
  • Pierce County
  • King County

The Puget Sound region is thriving and attracting large population and employment growth. This growth increases strain on our transportation infrastructure and services, resulting in increased traffic congestion and increased needs for maintenance and preservation. There is a need to move people

SR 20 - Discovery Road & Kearney Street Intersection Roundabouts Pre-Design Study

Location: SR 20
Timeline: Spring 2020 - Fall 2020
  • Complete
  • Jefferson County

The pre-design study looked at the signalized intersections on SR 20 at Discovery Road and Kearney Street. The traffic signals at these intersections are in need of replacement. The study examined replacing the traffic signals with compact roundabouts.

SR 202 - E Lake Sammamish Parkway to 244th Ave NE - Corridor Planning Study

Location: SR 202
Timeline: Summer 2018 - Summer 2019
  • Complete
  • King County

State Route 202 is an important east-west link for King County communities like Woodinville, Redmond, Sammamish, Fall City and North Bend. Thanks to growth and development, traffic on SR 202 has increased in the last decade, contributing to longer travel times for commuters and freight.

SR 202 Corridor Studies

Location: SR 202
Timeline: Fall 2020 - Summer 2021
  • In progress
  • King County

We are conducting two corridor studies along SR 202. One study will focus on safety concerns between 244th Ave NE to 324th Ave SE, and the second study will cover community needs between 324 Ave SE and SR 203 in Fall City.

Both studies will document strategies to improve operations,

SR 3 Roundabouts Pre-Design Study

Location: SR 3
Timeline: March - April 2022
  • Complete
  • Mason County

WSDOT routinely reviews rural intersections on the state highway system to find ways to reduce potential crashes. We look for locations that are at the highest risk for severe crashes.

This project will construct single-lane roundabouts at the following Mason County intersections on

SR 302 Elgin Clifton Road to SR 16 Corridor Study

Location: SR 302
Timeline: Fall 2007 - June 2013
  • On hold
  • Pierce County
  • Kitsap County

SR 302, an important east-west link for Key Peninsula communities, has been the subject of a corridor study designed to conform with the decision making requirements of the National Environmental Policy Act (NEPA). This area of the state's highway system located in Pierce and Kitsap counties has

SR 303 Corridor Study

Location: SR 303
Timeline: July 2019 - August 2021
  • Complete
  • Kitsap County

The City of Bremerton and WSDOT completed a comprehensive planning study of the SR 303 (Warren/Wheaton) corridor. Using the Practical Solutions approach, the study will look at the corridor from Burwell Street to NE Fairgrounds Road, particularly the segments within city limits. The study will

SR 503 Corridor Plan: Vancouver to Battle Ground

Location: SR 503
Timeline: February 2022 - March 2023
  • In progress
  • Clark County

The resulting long-term plan will help determine the type of transportation network SR 503 should support and how SR 503 interacts with surrounding land uses.

SR 507 and SR 702 Roundabouts Pre-Design Study

Location: SR 702, SR 507
Timeline: November 2021 - January 2022
  • In progress
  • Pierce County

WSDOT routinely reviews rural area intersections on its state highway system to find ways to reduce potential crashes. As a result of this review, we will replace the existing stop signs at three intersections in Pierce County with single-lane roundabouts. These roundabouts fit within the

SR 510 at McAllister/Rockcress Roundabout Pre-Design Study

Location: SR 510
Timeline: January - March 2022
  • Complete
  • Thurston County

To reduce potential crashes, we complete routine reviews of rural area intersections on the state highway system. As a result of this review, we will construct a roundabout on SR 510 at the intersection of McAllister Court SE/Rockcress Drive SE and remove the existing stop signs. This roundabout

SR 518 Corridor Planning Study

Location: SR 518
Timeline: Fall 2018 - Summer 2020
  • Complete
  • King County

Through this study, we determined priorities for future highway work or transit service adjustments. and developed practical, cost-effective concepts to help improve trip reliability and safety along the corridor. Our study partners included Burien, Des Moines, SeaTac, Tukwila, tribes, King

SR 702 8th Avenue South Roundabout Pre-Design Study

Location: SR 702
Timeline: June - August 2021
  • Complete
  • Pierce County

WSDOT is replacing the existing two-way stop at the intersection of State Route 702 and 8th Avenue South with a modern roundabout. The intersection currently has stop control on the northbound and southbound legs, and a span wire mounted, four-head flashing beacon. This project will remove the

SR 900 - Martin Luther King Jr. Way South Corridor Study

Location: SR 900
Timeline: Summer 2020 - Summer 2021
  • In progress
  • King County

State Route 900/Martin Luther King Jr. Way South in Skyway is a heavily-traveled commuter corridor with approximately 32,000 vehicles using this section each day. However, it lacks complete sidewalks for pedestrian connectivity between residences and community hubs. We are conducting a corridor

SR 99 Targeted Corridor Study

Location: SR 99
Timeline: Ongoing
  • In progress
  • Snohomish County

State Route 99 (Evergreen Way) in unincorporated Snohomish County is a heavily traveled corridor that serves as a major north-south alternative to I-5, and links Lynnwood, Everett, and other growing communities in Snohomish County. The area lacks sidewalks and other pedestrian and transit safety

State Route 4 Corridor Planning Study

Location: SR 4
Timeline: Dec. 2019 - Early 2021
  • Complete
  • Cowlitz County

The purpose of this planning study is to improve the overall connectivity and mobility in the study area, improve safety by reducing potential conflicts between modes and to enhance economic vitality opportunities supported by the previously mentioned goals. 

Tacoma to Puyallup Regional Trail

Location: SR 167
Timeline: 2021-2023
  • In progress
  • Pierce County

This Preliminary Engineering and Environmental Analysis will allow WSDOT and project partners to complete a design for a new Tacoma to Puyallup Regional Trail. The current study, led by WSDOT's

Tolling the SR 509 and SR 167 expressways

Location: SR 509, SR 167
Timeline: 2009 - 2013
  • Complete
  • King County
  • Pierce County

At the request of the Washington State Legislature, WSDOT prepared toll feasibility studies for SR 167 and SR 509 to examine tolling and construction options for the new SR 167 and SR 509 corridors. The studies provided insights into:

  • Potential funding and corresponding financial

Ultra-high speed rail study

Location:
Timeline: 2016-2028
  • In progress
  • Whatcom County
  • Skagit County
  • Snohomish County
  • King County
  • Pierce County
  • Thurston County
  • Lewis County
  • Cowlitz County
  • Clark County

WSDOT is studying how ultra-high-speed ground transportation (UHSGT) might serve as a catalyst to transform the Pacific Northwest. A stronger, better connected economic megaregion — stretching from greater Vancouver, British Columbia to metro Seattle, Washington to Portland, Oregon — has the

US 101 East Sequim Pre-Design Study

Location: US 101
Timeline: Summer 2021 - Spring 2022
  • In progress
  • Clallam County

US 101 connects Sequim, a city in Clallam County, with the rest of western Washington. It is a vital link for residents, businesses and visitors. The pre-design study will identify potential roadway improvements and will focus on safety, access and improving travel times using the

US 195 Corridor Crash Analysis

Location: US 195
Timeline: January 2010 - January 2016
  • Complete
  • Spokane County
  • Whitman County

The US 195 Corridor Crash Analysis is a traffic safety study that focuses on:

  • Identifying the most common circumstances or trends that contribute to serious and fatal injury crashes along the corridor.
  • Identifying low-cost solutions or countermeasures most likely to

Zero emission electric vehicle registrations in Washington

increased 192% between 2017 and 2021.

45 projects to improve freight rail structures and freight movement

were underway as of December 31, 2021.

Washington state leveraged $100,000 to secure $27 million

in funding for airport investments in Fiscal Year 2022.