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On Tuesday, Feb. 23, 2021, due to roadway settlement caused by heavy rainfall, both directions of State Route 401 (also known as the Lewis and Clark Trail Highway) between the Astoria-Megler Bridge and Naselle were closed.

In spring 2021, emergency contractor crews were able to…

The SR 410 White River Bridge between Buckley and Enumclaw reopened Friday, Oct. 17, after contractor crews completed repairs. On Aug. 18, 2025, an over-height vehicle struck several of the support beams on the bridge, causing serious damage that required us to close the bridge. After a complete…

In December 2025, a flooding event from Boise Creek just west of Enumclaw damaged State Route 410 at milepost 26.6. The road was closed Dec. 10, 2025 after the eastbound lanes were washed away. On Dec. 16, the road was reopened in a single-lane alternating traffic configuration using the westbound…

Starting in early 2023, contractor crews will kick off the much-anticipated project to enhance the SR 411 Cowlitz River Bridge, also known as the A Street Bridge or the PH-10 Bridge. This vital bridge connects the City of Castle Rock to the west side of the Cowlitz River.

The primary…

In fall 2025 contractors working for WSDOT will begin work to remove and replace a failing culvert underneath SR 411, better known as West Side Highway, just south of Castle Rock, in Cowlitz County.

On Friday, Oct. 24, 2025, construction to replace the failing culvert was completed…

In summer 2023 contactor crews working for the Washington State Department of Transportation resurfaced a nearly 2.5 mile stretch of SR 432 between milepost 7.19 near Industrial Way and milepost 7.19 near the Cowlitz River, in Longview, WA. Crews also resurfaced several off- and on-ramps along…

This project restored the north/south connection across State Route 500 at the Northeast Stapleton Road/Northeast 54th Avenue intersection in Vancouver by constructing a new pedestrian overcrossing that meets the Americans with Disabilities Act. Restoring access across the highway for people who…

Growth and development in eastern Clark County is contributing to an increase in traffic volumes and traffic related crashes along SR 500 - between the Northeast Robinson Road and Northeast 3rd Street intersections. To keep people moving safely, reduce travel times and crashes and to ensure this…

Washington State Department of Transportation’s contractor, Thompson Bros. Excavating, successfully constructed a new shared-use path on the south side of State Route 500, also known as Northeast Fourth Plain Boulevard, between Northeast 162nd and Northeast 166th avenues, allowing those who bike,…

This project improved safety at the intersection of State Route 503 and Northeast Rock Creek Road by installing a compact roundabout. After reviewing five-years of traffic data that included severe injuries, a fatality, and many cases of property damage, this location was identified for improvement…

This project constructed a pedestrian hybrid signal, creating safer access for pedestrians crossing State Route 503 to and from Prairie High School and the nearby transit stop.

On Saturday, Dec. 23, following the installation of a new 48-inch culvert, stabilizing, and back filling the failure area with rock, and reconstructing the roadway, NW Construction General Contracting, Inc., the emergency contractor has successfully restored two lanes of travel, and lifted the…

WSDOT is planning to create fish passages at two locations on State Route 503 Spur. The first location is at milepost 35.70, where a small stream flows into Dog Creek, and the second location is at milepost 35.85, where Dog Creek itself is crossed. These locations are in Cowlitz County, which is…

Shortly after 9 p.m. on Mother’s Day, May 14, 2023, more than 300,000 cubic yards of debris slid about 2,000 feet down a hillside above SR 504 near milepost 49. The slide buried the highway in rock, mud, ice and water and destroyed the 85-foot Spirit Lake Outlet Bridge.

Starting…

On Tuesday, July 6, 2021, an over height load was traveling southbound on I-5 when it struck and damaged the SR 506/Toledo-Vader Road overpass that spans over the interstate. Following the bridge strike, WSDOT bridge inspectors determined that the damage was extensive and they closed the overpass…

State Route 507 (SR 507) between the Skookumchuck River Bridge and the Thurston County line within Centralia and unincorporated Lewis County is in need of pavement preservation work to protect the public’s investment in the highway. This work is necessary to keep the roadway in good condition and…

In July 2026, contractor crews will return to finish work to protect the SR 508 embankment from erosion caused by the Tilton River, between mileposts 28.8 and 28.92 in Lewis County. Contractors will install two engineered log jams upstream to help reduce erosion and flooding, lower the risk of the…

The SR 509 Completion Project in King County is part of the Puget Sound Gateway Program, which also includes the SR 167 Completion Project in Pierce County. Together, these projects complete two of the Puget Sound region’s most critical freight corridors and improve access to I-5, the ports of…

Reconnecting waterways where our roads act as barriers is a priority for the state. In western Washington, that means building hundreds of fish passable structures under state highways to create habitat essential for meeting fish recovery goals.

A culvert below State Route 509 west…

WSDOT replaced a culvert that failed beneath SR 510 near Lacey.

Crews will build the three remaining miles of SR 510 between Cullens Road and 170th Street Southeast. The roadway will have two lanes. The project will also include a new shared-use path for people who walk, bike or roll.

Crews will build a single-lane roundabout on State Route 510 at the intersection of McAllister Court SE/Rockcress Drive SE in Lacey. The improvement will reduce the potential for collisions.

This project supports ongoing traffic management strategies along the State Route 512 corridor by adding a new Wavetronix data sensor between I-5 and Steele Street in Lakewood. The SR 7 on-ramp to eastbound SR 512 in Parkland will also be extended, widened and improved with new lighting.

This project replaced a 2-foot-diameter clay culvert that blocked fish passage with a 20-by-9-foot cement box culvert that allows fish and other wildlife to move freely up and down the creek. The project also placed natural features into the Barnes Creek streambed.

This project will rehabilitate the existing pavement and preserve the roadway surface and bring curb ramps that are impacted by resurfacing work up to meet current ADA accessibility criteria.

Crews will grind and inlay new Hot Mix Asphalt (HMA), perform pavement repair, striping…

Crews working for WSDOT applied spray sealant to the bridge deck and soffits near expansion joints in both directions of the State Route 520 Evergreen Point floating bridge. The sealant will protect the bridge from corrosion, prolong its service life and help keep the bridge in a state of good…

The SR 520 Bridge Replacement and HOV Program enhances travel safety and mobility with modern, structurally stronger bridges, as well as substantial transit and roadway improvements along this urban corridor. Built in stages, the improvements extend from I-405 in Bellevue to I-5 in Seattle.

This project added bus/carpool lanes in both directions between 108th Avenue Northeast in Bellevue and Lake Washington’s eastern shore. The project also built three landscaped, community-connecting highway lids over the highway, two transit stations in the highway median and the first leg of a…

We replaced the world's longest floating bridge – a four-lane, 1960s-era structure – with a safer, six-lane bridge designed to withstand stronger windstorms and waves. Opened in April 2016, the new bridge also added shoulders for disabled vehicles and a separated, 14-foot-wide path for…

The SR 520/I-5 Express Lanes Connection Project will create a dedicated reversible transit and carpool connection between SR 520 and the I-5 Express Lanes, along with a reversible transit/carpool ramp at the I-5/Mercer Street interchange.