Search projects

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…

Shortly after 9 p.m. Sunday, May 14, 2023, more than 300,000 cubic yards of debris from an adjacent hillside fell approximately 2,000 feet above SR 504 and covered the roadway with rock, mud, ice and water, causing catastrophic damage to the 85-foot Spirit Lake Outlet Bridge at milepost 49.

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…

Crews removed and replaced a failing culvert under the highway.

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. The improvement will reduce the potential for collisions.

In 2021, contractor crews working for WSDOT replaced the more than 20-year-old worn grid deck on the Montlake Bridge. They also made expansion joint and mechanical repairs so the movable span can continue to operate reliably and meet the growing multimodal traffic demands of northeast Seattle. In…

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.

During summer 2023, our contractor crews replaced the damaged girder on the 24th Avenue South bridge over SR 518 near the Sea-Tac International Airport. Crews also made bridge drain and drainpipe improvements in the area.

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…

With this Connecting Washington project, we made multiple improvements to the State Route 520/148th Avenue Northeast interchange within the cities of Bellevue and Redmond.

Our contractor, Granite Construction, built a direct-access off-ramp from eastbound SR 520 to the Overlake…

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.

This project is complete.

The Montlake Project will improve transportation for both motorized and nonmotorized travel along the corridor with a new SR 520 eastbound bridge over Union Bay. This project also builds a new, three-acre lid covering the highway in Montlake that will…

The SR 520 floating bridge is supported and stabilized by 77 concrete pontoons . The Pontoon Construction Project built a casting basin and 33 of the bridge’s pontoons in Aberdeen, Washington. We built 44 of the bridge’s smaller pontoons in Tacoma, Washington, as part of the Floating Bridge and…

The Portage Bay Bridge and Roanoke Lid Project will replace the aging Portage Bay Bridge with a seismically resilient structure that includes improved bus/carpool travel and an extension of the SR 520 Trail. This project also builds a landscaped lid between Seattle’s Roanoke Park and North Capitol…

The West Approach Bridge North Project extended SR 520’s three westbound lanes, including a transit/HOV lane, from the new floating bridge to Seattle’s Montlake neighborhood. It also expanded the new SR 520 Trail across Lake Washington to Seattle.

Currently, over half the trips from westbound SR 520 are traveling to the Bellevue vicinity. A new project will allow westbound drivers the option to access the downtown Bellevue vicinity by exiting SR 520 onto 124th Avenue Northeast before reaching the heavily congested I-405/SR 520 interchange.…

SR 522 in Snohomish County is an increasingly important east-west route connecting communities between Woodinville and Monroe. One section between Paradise Lake Road in Maltby and the Snohomish River remains one-lane in each direction. We plan to widen the highway to two lanes in each direction,…

This project will remove a fish passage barrier along Cat Whisker Creek at State Route 522, just east of 61st Avenue Northeast in Kenmore. Contractor crews working for WSDOT will remove an existing 6-foot by 3-foot box culvert and replace it with a fish-passable structure. This new structure has…

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

A culvert below State Route 522…

This project will remove a barrier to fish passage along Martha Creek on State Route 524 near Lynnwood. Contractor crews working for WSDOT will remove the existing culvert and replace it with a fish-passable structure. This new structure has the potential to open more than 1.5 miles of habitat for…

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

A culvert under State Route 524…