Project news

Why is WSDOT rebuilding the US 101 Elwha River Bridge?

Built in 1926, the 3-span, 388-foot concrete arch bridge has served the community for more than 90 years. Over the last several years, the Elwha River has dramatically changed its course and flow, leading to significant erosion around the bridge foundations.  As a result, WSDOT estimates the riverbed around the bridge’s piers has lowered 14 feet.

View historical photos (pdf 731 kb)

The lowered riverbed revealed the piers’ seals, prompting WSDOT to do borings to verify the depth of the foundations. The borings, done in October 2016, revealed the foundations are on gravel, not bedrock. This finding was in contrast to what the original 1926 engineering plans showed.  As a result, WSDOT immediately installed almost 5,000 tons of riprap (large boulders) around both piers to help prevent further erosion. Additional bridge monitoring using tilt meters, crack meters, water flow meters, surveys and visual observations are also underway.

The End Result

The new Elwha River Bridge will be 40 feet wide that accommodates two 12-foot lanes and two-8 foot shoulders (the current bridge is 28 feet wide). The wider bridge will create a more comfortable crossing for motorists and provide adequate shoulder room for bicyclists and pedestrians. Additionally, the new alignment with US 101/Olympic Hot Springs Road will have a more gentle curvature, with a higher design speed (40 mph) at the east end of the bridge.

Needs & benefits

The US 101 Elwha River Bridge is vital to the well-being of the communities on the Olympic Peninsula. Replacing the bridge will ensure that the US 101 route continues to be a reliable transportation facility for decades to come.

Additional project benefits include:

• transit stops on both the west and east ends of the bridge, locations of which were coordinated with Clallam Transit;
• relocating the intersection further east to provide better sight lines and intersection geometrics;
• installing illumination at the intersection (no illumination is there presently);
• building turn pockets on US 101 to Olympic Hot Springs Road;
• building a short acceleration lane on northbound US 101 from Olympic Hot Springs Road;
• restore the parking access that was there before with a gravel parking lot

Timeline

• Ongoing NEPA process through Fall 2019
• Winter 2019 anticipate being under contract (pending concurrence between all parties involved through a Memorandum of Agreement)
• Spring 2020 anticipated construction begins
• Fall 2021 traffic shifts onto new bridge