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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 3 Gorst Area Planning and Environmental Linkages Study
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
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
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
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
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
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 500 NE Fourth Plain Blvd to NE 76th Street – Complete Streets Pre-design Study
This section of SR 500 has gaps in bicycle and pedestrian facilities that make walking, biking and rolling difficult within the project limits. The Complete Streets pre-design study will develop concepts for
SR 503 Corridor Plan: Vancouver to Battle Ground
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 503 Spur/N of Speelyai Creek to Dog Creek – Culvert Replacements
Both culverts need replacement. The proposed project will swap out the existing pipe and box culvert with fish-passable structures.
The current culverts block fish completely. Replacing these culverts and fixing the stream will allow fish to reach important areas for spawning. The new
SR 507 and SR 702 Roundabouts Pre-design Study
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
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
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
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
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 worked with the city of Covington to consider intersection control options for the five intersections along with
SR 518 Corridor Planning Study
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 532 Existing Conditions Analysis - Completed Spring 2024
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
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 7 Pre-design Study
WSDOT has a safety improvement project on State Route 7 between SR 507 and 267th Street. The project will build roundabouts at 260th Street E, 224th Street E, 22nd Avenue E and at SR 507. This pre-design study will also use
SR 702 8th Avenue South Roundabout Pre-Design Study
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
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 99 Lynnwood and Unincorporated Snohomish County Pre-Design Study
State Route 99 (SR 99) in the city of Lynnwood and unincorporated Snohomish County is a heavily traveled corridor that serves as a major north-south alternative to Interstate 5 (I-5), and links Lynnwood, Everett and other growing communities in Snohomish County. The area lacks safe crossings,
State Route 4 Corridor Technical Report
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
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
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
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
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
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
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.
This pre-design study will use
US 12 and SR 7 - Intersection Improvements
US 12 Naches Active Transportation Corridor Study
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.