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Capital Improvement Program
Mount Si Bridge #2550A
Project No.:
200994
Project limits:
Mid Fork Snoqualmie, east of North Bend
Current phase: Construction completed.
Project type:
Safety
Thomas Bros. Map No.:
660j2
Project description
Replace the structurally deficient and functionally obsolete bridge. The replacement bridge project will have two travel lanes and two shoulders and a sidewalk for non-motorized traffic. The project will eliminate the abandoned trail parking lot by the northeast bridge corner.
Why is King County doing this project?
Mount Si Bridge provides sole access to about 400 homes and is located along a lifeline route. The bridge has a low sufficiency rating due to its deteriorated condition. The bridge is currently load limited, seismically vulnerable, structurally deficient, and functionally obsolete. It has low overhead clearance, narrow width, rotting timber supports, and substandard approaches and guardrails. Mount Si bridge ranks high in the County's Bridge Replacement program.
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| Status as of
November 19, 2009 |
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The project construction phase began in May 2007and the Declaration of Phyical Completion for the project was issued on July 13, 2009.
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Environmental InformationConstructed stormwater wetlands are included in the new bridge project and will provide water quality treatment which will improve water quality outfall to Middle Fork Snoqualmie River.
King County Road Services is working with KCDNRP to provide environmental enhancements at the future Tanner Landing Park property, upstream from the bridge site along the Snoqualmie Valley Trail. Efforts include invasive weed removal, planting native trees and shrubs, and building brush piles to provide cover for small animals and birds. Trees removed from part of the project will be set upright as snags to provide perches for large birds such as Osprey and Red Tailed Hawks. Two nesting platforms will be built at the park to encourage Osprey to nest at the Park.
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See also
King County emergency phone numbers
King County public safety links
King County Traffic Engineering and Maintenance Section
Radar Readerboard Program
Signs, signals and crosswalks
Title VI information
Traffic safety in your neighborhood
Washington State Department of Transportation traffic accident information
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How does the CIP work?
The Road Services Division Capital Improvement Program (CIP)
contains all design, construction and studies for improvements on roads, bridges or transportation facilities in unincorporated areas in King County.
We have a glossary to help explain our terms and jargon.
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