The Road Services Division of King County’s Department of Local Services reopened the Ames Lake Bridge on Ames Lake-Carnation Road NE on Friday, April 25.
During the 10-month closure, crews completely rebuilt the 100-year-old timber structure. The new bridge improves safety and restores a key east-west connection in the Snoqualmie Valley, one of the few routes in the area likely to remain passable during a flood event.
The new bridge improves safety and restores a key east-west connection in the Snoqualmie Valley, one of the few routes in the area likely to remain passable during a flood event. The old bridge had weight restrictions, and a sharp curve in the road near it led to limited visibility. The replacement removes weight limits, has a wider, straighter approach to improve sightlines, and includes features that protect the stream and wetlands.
“Ames Lake-Carnation Road NE is a critical commuter and community route,” said Tricia Davis, Director of King County Road Services. “We know the closure caused real inconvenience, and we appreciate the community’s patience. Rebuilding this bridge is an important investment in restoring a reliable connection, improving safety for travelers, protecting the environment, and meeting the long-term needs of the region.”
The bridge reopens during Earth Week, a timely milestone for a project with significant safety and environmental improvements. Crews removed toxic creosote-treated timber piles from the surrounding wetlands and restored the natural channel of Ames Creek to support a healthier habitat. Large logs and other natural materials were placed in the stream to improve fish and other wildlife conditions. Protective measures were used throughout construction to prevent debris from entering the stream.
Granite Construction served as the project contractor, with Jacobs Engineering Group, Inc. as the design consultant and engineer of record.
Project funding sources include the County Road Administration Board (CRAB) – Rural Arterial Program (RAP) and King County road funds. The estimated cost for design and construction is $7.6 million, approximately $3 million below budget.
Crews will return in late May and June 2025 for minor utility work and punch list items. Ames Lake – Carnation Road NE will stay open. Flaggers will guide traffic through the work zone.
[Information provided by King County Department of Local Services]
