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King County Flood Warning Center issues Phase 4 flood alert for Snoqualmie River, with possible widespread flooding in valley


The King County Flood Warning Center has issued a Phase 4 flood alert for the Snoqualmie River, with widespread flooding possible across large portions of the Snoqualmie Valley. The Flood Warning Center has been monitoring flood conditions since opening early in the evening on Monday, Oct. 21.


The Snoqualmie River has reached a Phase 4 floodfcd_color_logo alert level with significant flooding possible across the Snoqualmie Valley, according to the King County Flood Warning Center

As of 2:30 a.m. on Tuesday, Oct. 22, the sum of the Snoqualmie River’s three forks was 39,720 cubic feet per second (CFS), slightly higher than the Phase 4 flood alert threshold of 38,000 CFS. 

At these flows, some areas of the Snoqualmie Valley could experience floodwaters with dangerous high velocities, and significant road closures are possible.

The Tolt River remains at a Phase 3 flood alert level. As of 2:30 a.m. on Tuesday, Oct. 22, the Tolt River near Carnation was flowing at 6,140 CFS, with increased flood flows in low-lying areas along the river upstream of Carnation, and some road closures are possible.

Flood Warning Center employees 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

During river flooding events, King County serves as a clearinghouse for information on flood conditions, operating a recorded message center with continuous updates of river gage readings and flood phases and other related information. Reach the Flood Warning Center at 206-296-8200 or 1-800-945-9263. Interpreter assistance in multiple languages is available.

King County offers everyone free access to KC Flood Alerts, an automated system that allows subscribers to receive customized alerts of potential flooding for any or all of King County’s seven major river systems.

Immediate notifications about pending high water are sent to email, smart phone text or voicemail, providing subscribers with the maximum amount of warning about potential high water.

Find the KC Flood Alerts link at This website is a valuable preparedness resource, with all of the latest information about river levels and road conditions, plus weather reports and other critical links.

Questions or assistance with flooding on smaller streams or urban drainage problems can be called in to 206-477-4811 during business hours, or 206-477-8100 after hours or on weekends.

Problems on County maintained roads can be reported by calling 206-477-8100 or 1-800-KC-ROADS.

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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. Information is available at