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King County Flood Warning Center issues Phase 3 flood alert for Snoqualmie River, Phase 2 for Tolt River


The King County Flood Warning Center has issued a Phase 3 flood alert for the Snoqualmie River, with moderate flooding possible across low-lying areas as a result of steady rainfall in the upper watershed. The Tolt River has reached a Phase 2 flood alert level, with minor flooding possible upstream of Carnation.


The King County Flood Warning Center issued afcd_color_2018 Phase 3 flood alert for the Snoqualmie River at 5:30 a.m. on Sunday, Nov. 4, with moderate and widespread flooding possible as a result of heavy rainfall this weekend.

As of 5:45 a.m. Sunday, the sum of the Snoqualmie River’s three forks was flowing at 21,220 cubic feet per second (CFS), slightly higher than the Phase 3 flood alert threshold of 20,000 CFS.

At these flows, flooding be expected in numerous low-lying areas of the Snoqualmie Valley, and roads could overtop with floodwaters.

The Flood Warning Center has also issued a Phase 2 flood alert for the Tolt River, with minor flooding possible in low-lying areas upstream of Carnation.

The Tolt River was flowing at 4,210 CFS as of 5:15 a.m., well above the Phase 2 flood alert threshold of 3,500 CFS. 
The Flood Warning Center opened at 3:30 a.m. on Sunday, Nov. 4, to monitor minor flooding along the Snoqualmie River – the result of heavy rainfall in the upper watershed.

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