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King County Road Services - Capital Improvement Program

Fifteen Mile Creek Bridge #1384B

Project No.:  1026795
Project limits:  100 feet either side of bridge
Project type:  Bridge
Thomas Bros. Map No.:  658C3

Project description

The Fifteen Mile Creek Bridge project will replace the existing deficient bridge with a new bridge and reconstruct the approaches while maintaining access for residents north of the bridge that live on a sole access road.

Why is King County doing this project?

The bridge is structurally deficient and the foundation is scour critical. The structural deficiency is due to a failed substructure and a load limit to vehicles. The bridge foundation is scour critical due to the high risk of a high river flow event causing the bridge to be closed or fail. Currently, the bridge is open only to one-way, one-at-a-time traffic.

Project management phase:  Construction completed.

Status as of April 10, 2014

The project construction began on August 15, 2013. The road was re-opened to two-way traffic on November 21, 2013.


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