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Bridge Washing in Unincorporated King County
Crews use different washing tools to meet the needs of each bridge and comply with Washington Department of Ecology and Washington Department of Fish and Wildlife Permits. Here, crews used a hand-held washer cleaning the lower levels of the Green River Gorge Bridge located to the west of Black Diamond, WA in 2019. After dry cleaning, crews wash with the minimum water pressure necessary to accomplish the work and prevent the removal of existing paint and subsequent discharge to waters of the state.
Overview
Bridges must be regularly cleaned in order to extend their useful life and ensure they perform safely. Bridges can become dirty from sand, dirt, gravel, pollution, and anti-icing chemicals, which can fade paint and eat away at steel.
Before and after photos of a 2018 bridge washing project on Flaming Geyser Bridge No. 3024 located north of Enumclaw, WA. View larger image (2MB)
Bridges to be washed in 2025
These bridges will be cleaned by King County in 2025, as a part of preventative maintenance efforts.
Mt. Si Bridge No. 2550A
Google Map | Area Map (165KB)
Sunday Creek Bridge No. 364C
Google Map | Area Map (141KB)
Stossel Bridge No. 1023A
Google Map | Area Map (231KB)
Green Water Bridge No. 3050B
Google Map | Area Map (251KB)
Norman Bridge No. 122K
Google Map | Area Map (359KB)
List of 2025 bridge washing details
| Structure ID | Bridge Number | Bridge Name | Roadway | Milepost | Latitude | Longitude | Waterbody Crossing | Scheduled Activity | Anticipated Timeframe | Approximate Duration | Traffic Impacts | Notes |
| 08779200 | 2550A | Mt Si | SE Mt Si Rd | 2.51 | 47.487000 | -121.75945 | Middle Fork Snoqualmie River | Truss | Q1 2025 | 4d | 1 lane closure | Steel truss bridge |
| 08823300 | 364C | Sunday Creek | North Fork Rd SE | 15.87 | 47.655499 | -121.64003 | Sunday Creek | Full Bridge | Q1 2025 | 2d | 1 lane closure | Steel truss bridge |
| 08097200 | 1023A | Stossel | NE Carnation Farm Rd | 3.36 | 47.665928 | -121.92556 | Snoqualmie River | Truss | Q1 2025 | 3d | 1 lane closure | Steel Truss Bridge |
| 08105200 | 3050B | Green Water | Drive Uhlman Rd E | 0.14 | 47.155945 | -121.65153 | Greenwater River | Full Bridge | Q2 2025 | 1d | 1 lane closure | Steel Girder bridge |
| 08460200 | 122K | Norman | 428th ave SE | 0.92 | 47.515910 | -121.76980 | Middle Fork Snoqualmie River | Deck and Rail | Q1 2025 | 2d | 1 lane closure | Concrete box girder |