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Road Services Division Capital Improvement Program (CIP)

Old Cascade Highway/Miller River Bridge #999W West Improvements

›› Also see the public outreach website.

Project No.:  1129595
Project limits:  Old Cascade Hwy - Miller River Road to Miller River west ban
Project type:  Road Reconstruction/Preservation
Thomas Bros. Map No.:  514G5

Project description

Old Cascade Highway/Miller River Bridge West Improvements Project - This project makes drainage and pavement improvements on Old Cascade Highway and constructs a turnaround on the highway at the west bank of the Miller River.

Why is King County doing this project?

This project will make improvements to damaged and remaining portions of the Old Cascade Highway. In January 2011, a winter flood tore through the Skykomish Valley and changed the course of the Miller River. The flood destroyed a 100-foot section of the Old Cascade Highway, severing it into two sole access roads on both sides of the river, and left the Miller River Bridge #999W damaged and cut off from the road. In order to maintain the use of this sole source road and to prevent possible additional damage, this project will improve the drainage and resurface a portion of the existing roadway. In addition, a turnaround on the west side of Old Cascade Highway will be constructed to provide a safer terminus and a portion of the pavement from the river bank to the turnaround will be removed.

Project management phase:  Final Design

Status as of January 28, 2020

Final Design


Adopted Capital Improvement Program & program overview

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.

Vicinity map

Vacinity map