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King County Road Services - Capital Improvement Program

Patterson Creek Bridge #180L

Project No.:  1026732
Project limits:  292th Ave SE @ 0.2 mile south to SR-202
Project type:  Bridge
Thomas Bros. Map No.:  598J2

Project description

The Patterson Creek Bridge project will remove the existing bridge, and replace it with a new structure that conforms to modern road standards, preserving existing road network function.

Why is King County doing this project?

The existing bridge was built in 1950 is substandard compared to today’s standard. It is seismically vulnerable, and founded on creosote treated timber, and the hydraulic opening is limited. It is functionally obsolete.

Project management phase:  Closeout

Status as of April 10, 2014

Construction is complete and the bridge opened to traffic on November 20,2012.

Environmental information

The bridge is over Patterson Creek, which flows through a deep, flat, depositional channel at the project location. The banks of the ditched channel are high, steep, and covered with reed canarygrass, nightshade, and blackberry. The slow, deep, cool waters and abundant cover from undercut banks and overhanging vegetation provide important rearing and refuge habitat for five species of salmonid fishes: coho salmon, Chinook salmon, cutthroat trout, and rainbow/steelhead trout. These fishes also use the mainstem creek as a migration corridor to spawning and rearing habitat in tributaries such as Canyon Creek and Tributary 07.0377, and the Snoqualmie River.

See also

Environmental compliance for bridge activities External link graphic
King County Annual Bridge Report
Overlegal truck permit
Road closures
Road standards
Roads' future - learn what's needed to preserve our road network
Seattle bridges External link graphic
Title VI information
WSDOT Historic Bridges External link graphic

How does the CIP work?

The Road Services Division Capital Improvement Program (CIP) contains all design and construction and studies for improvements on roads, bridges or transportation facilities in the unincorporated areas of King County. We have a glossary to help explain our terms and jargon.

Budget and Funding

Vicinity map

Vacinity map

Project supervisor

Larry Jaramillo