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

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65 results

SR 202 Corridor Studies

Location: SR 202
Timeline: Fall 2020 - Winter 2022
  • 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

SR 24 East Valley to Moxee Corridor Study

Location:
Timeline: June 2022 - April 2023
  • In progress
  • Yakima County

The study will collaboratively address the transportation network performance, accessibility and safety gaps to support local communities and the traveling public in the East Valley area. The study will identify ranked strategies to increase mobility and transportation alternatives for all modes

SR 3 Gorst Area Planning and Environmental Linkages Study

Location: SR 3
Timeline: June 2024 - December 2025
  • In progress
  • Kitsap County

This study looks at adding a lane to SR 3 in each direction from Gorst to SR 304. It also explores elevating the roadway through Gorst, replacing the Navy’s railroad crossing of SR 3 and replacing nearby fish barriers.

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 on East Agate Road and East Pickering Road in Mason

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 302 Roundabout Pre-Design Study

Location: SR 302
Timeline: January - July 2023
  • Complete
  • Pierce County

Information about the study, the recommended roundabout and feedback WSDOT received during the online open house is now available for

SR 302 Victor Area Corridor Study

Location: SR 302
Timeline: Summer 2022 - Summer 2023
  • Complete
  • Mason County
  • Pierce County

SR 302 is an important east-west link through Mason and Pierce Counties. The road is an important connection for Belfair and Purdy. It also provides a connection between SR 3 and SR 16 for residents, businesses and visitors.

The study looked at improvements to address roadway collapse

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 - Summer 2023
  • In progress
  • Clark County

WSDOT is studying how people use SR 503 and how continued growth might affect future use. Focus areas include addressing gaps in active transportation (e.g., biking, walking and rolling) facilities, access to transit, vehicle traffic pain points, safety improvements and freight mobility planning

SR 507 and SR 702 Roundabouts Pre-design Study

Location: SR 702, SR 507
Timeline: November 2021 - January 2022
  • Complete
  • 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 507 Roundabout Pre-design Study

Location: SR 507
Timeline: November 2022 - April 2023
  • Complete
  • Thurston County

Each year, WSDOT looks at all rural stop-controlled intersections on our state highways to identify ways to reduce potential crashes. For some intersections, WSDOT develops a safety plan that outlines ways to manage travel speeds and reduce conflict points.

As a result of a recent safety

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 512 Corridor Study

Location: SR 512
Timeline: July 2022 to June 2023
  • Complete
  • Pierce County

SR 512 is an important east-west link through Pierce County that connects the cities of Lakewood and Puyallup. This highway provides a vital connection between Interstate 5 and SR 167 for residents, businesses and visitors. The study identified potential multimodal system improvements and

SR 516 - Covington Targeted Study

Location:
Timeline: Spring 2022-Spring 2024
  • In progress

SR 516 through Covington is a heavily traveled road that serves as the community's main commercial route. As the area grows, the demand on the roadway is expected to increase. WSDOT is working with the city of Covington to consider multimodal access, safety, environmental and performance

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 525 Mukilteo Bridge Over Railroad - Bridge replacement - Environmental justice assessment

Location:
Timeline: 2023-2028
  • In progress

Washington's environmental justice law, known as the Healthy Environment for All (HEAL) Act, requires WSDOT to conduct Environmental Justice Assessments when considering significant agency actions. These actions are those that initiated after July 1, 2023, and consist of WSDOT transportation

SR 532 Existing Conditions Analysis - Completed Spring 2024

Location: SR 532
Timeline: Fall 2021 - Spring 2024
  • Complete
  • Snohomish County

SR 532 is the primary east-west corridor to I-5 for the City of Stanwood, Camano Island and unincorporated areas of Snohomish County. Over the last several years, this area has experienced increased levels of vehicular and commercial truck traffic during peak travel periods. In addition, the

SR 542 Deming Corridor Study

Location: SR 542
Timeline: January 2022-December 2022
  • In progress
  • Whatcom County

State Route 542, Mount Baker Highway, connects communities in eastern Whatcom County with the rest of Washington State while also providing a gateway to outdoor recreation and tourism opportunities near Mount Baker. This route also acts as an economic corridor transporting over 3 million tons of

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 - Winter 2023
  • 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

SR 900/57th Ave S to S 135th – Environmental justice assessment

Location:
Timeline: 2024-2027
  • In progress

Washington's environmental justice law, known as the Healthy Environment for All (HEAL) Act, requires us to conduct environmental justice assessments when considering significant agency actions, like this project.

This environmental justice

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 Technical Report

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

This report is intended to improve the overall connectivity and mobility in the report area, increase 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
  • Complete
  • Pierce County

The spuyaləpabš Trail, formerly referred to as the Tacoma to Puyallup Regional Trail, will be a 12-mile regional shared use path that connects downtown Puyallup to Fife and downtown Tacoma. It will provide people who live and work in the area with a new option to travel without a motorized

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

Transportation Impacts of Lower Snake River Dam Removal

Location:
Timeline: January 2024 – December 2026
  • In progress
  • Statewide

The Snake River from Clarkston to Pasco contains four dams (Ice Harbor, Lower Monumental, Little Goose and Lower Granite). There has been much interest in removal of these dams for the benefit of salmon, steelhead, Pacific lamprey, bull trout, sturgeon and other native fish species. While there

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 high-speed ground rail 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 potential to thrive in the

US 101 East Sequim Pre-Design Study

Location: US 101
Timeline: Summer 2021 - Summer 2022
  • Complete
  • 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 identified roadway improvements focused on safety, access and improving travel times using the

US 101 Paving Pre-design Study

Location: US 101
Timeline: September 2023 - July 2024
  • In progress
  • Clallam County

Two segments of US 101 are scheduled to be repaved. Segment one is near Port Angeles from East Kolonels Way to Shore Road. Segment two spans Carlsborg and Sequim from Kitchen-Dick Road to Simdars Road. The pre-design study will conduct a Complete Streets analysis. Complete Streets looks at ways

US 12 Naches Active Transportation Corridor Study

Location:
Timeline: Summer 2023 - Summer 2024
  • In progress

The Town of Naches, the Yakima Valley Conference of Governments (YVCOG) and the Washington State Department of Transportation (WSDOT) are working together to provide a safe, reliable and effective transportation network for drivers, cyclists and pedestrians along the US 12 corridor in Naches,

166,800 electric vehicle

registrations in Washington in 2023, up from 114,600 in 2022.

87 wetland compensation sites

actively monitored on 918 acres in 2023.

25,000 safe animal crossings

in the Snoqualmie Pass East Project area since 2014.