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Natural Resources and Parks

King County, Washington

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Dec. 12, 2010

Snoqualmie River rises to Phase III flood alert level as rain continues to pound King County

Tolt River also at Phase III; Flood Warning Center monitoring rivers countywide

The Snoqualmie River has joined the Tolt River at the Phase III flood alert level and could also experience moderate flooding, as heavy rain from the “Pineapple Express” continues to pour into the region. The King County Flood Warning Center has been open since 2:15 a.m. Sunday to closely to monitor conditions.

As of 9:30 a.m. Sunday, the sum of the Snoqualmie River’s three forks was 20,410 cubic feet per second (CFS), just above the Phase III flood alert threshold of 20,000 CFS. At this level, flooding could be expected across much of the Snoqualmie Valley and many roads could be overtopped, including the Fall City -Carnation Road, Tolt Hill Road, Novelty Flats Road and others.

Meanwhile, the Tolt River remains at a Phase III flood alert level. As of 9:30 a.m., the Tolt River at Carnation was flowing at 6,230 CFS. At this level, moderate flooding could be expected along the Tolt, including potentially deep and swift flowing water in the San Souci neighborhood.

King County flood patrol crews have been dispatched to observe flood conditions from the field and report their findings to the Flood Warning Center. Crews are currently covering the Snoqualmie and Tolt rivers, and will monitor other river systems as conditions warrant.

Flood Warning Center staff will monitor stream gages and weather reports, and will provide updated information on river conditions as necessary. Real-time river level information is available online at

Updated information on flooding will also be posted on the King County website at, or via RPIN, the area's regional website at A recorded flood-information hotline is also updated each hour for citizens wanting information in flood areas. The number is 206-296-8200 or 1-800-945-9263.

Citizens who need help interpreting flood information should call 206-296-4535 or 1-800-768-7932. Problems on County maintained roads can be reported by calling 206-296-8100 or 1-800-KC-ROADS.

Motorists are strongly advised to heed all road closure and detour signs; driving through flooded streets is the number-one cause of deaths during flood events.

A new, automated flood alert system is now available and provides real-time warning of potential high water on more than a half-dozen rivers. King County residents and business owners can sign up to receive King County Flood Alerts by visiting, or by calling 206-263-3400 during regular business hours to register by phone. Messages of potential high flows on any of King County’s major river systems can be sent by phone, text or e-mail.

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The King County Flood Control District is a special purpose government created to provide funding and policy oversight for flood protection projects and programs in King County. The Flood Control District’s Board is composed of the members of the King County Council. The Water and Land Resources Division of the King County Department of Natural Resources and Parks develops and implements the approved flood protection projects and programs. Visit for more information.

Related information

Flooding services and information

Snoqualmie-Skykomish Watershed

What to do before, during and after a flood