SR 92 - Pilchuck River - CED - Completed September 2016

Contractor crews built a protective wall of rocks, logs, root wads and plants to stabilize the eroding Pilchuck River bank before it undermined SR 92 west of Granite Falls.

The river bank was eroding at a rate of 30-40 feet each year. By the summer of 2016, it was within 40 feet of SR 92.


How you benefit

Improves safety
The protective wall prevents the river from continuing to erode the river bank, reducing the risk of the highway being seriously undermined or destroyed.

Protects environment
Shrubs and trees previously lost to erosion were replaced with new native vegetation that  helps prevent additional erosion and will improve the existing wildlife habitat.

Economic incentive
SR 92 is an important east-west highway in Snohomish County. Completing the work before the road was severely damaged or even destroyed saved millions of dollars in emergency replacement costs and keeps freight and commuters moving.


Partnerships & cooperation
WSDOT coordinated this work and the construction impacts to the river and fish with the city of Granite Falls, Snohomish County, Department of Ecology and Tulalip Tribes.


Pre-Existing Funds (PEF): $3,193,000
Total: $3,193,000


Contact us
WSDOT communications
15700 Dayton Ave. N.
Seattle, WA 98133

A small map showing the project site along SR 92 in Granite Falls.
View larger map

A small photo that shows the Pilchuck River back in its normal channel with the newly reinforced riverbank.
View more pictures of the riverbank reinforcement work from the start of the project to the end.

A small picture showing erosion under a house along the Pilchuck River near SR 92. The house was lost to the river in 2012.
In 2012, the Pilchuck River claimed the garage of a home near the river. The house also fell into the river.