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King County Flood Warning Center issues Phase 2 flood alert with minor flooding possible along rain-swollen Tolt River

Summary

The King County Flood Warning Center has issued a Phase 2 flood alert for the Tolt River, with minor flooding possible in low-lying areas upstream of Carnation. Meanwhile the Snoqualmie River remains at a Phase 3 flood alert level, with flooding of varied depths occurring in areas of the Snoqualmie Valley. The Flood Warning Center opened at 6:15 p.m. on Monday, Oct. 21 to monitor conditions.

Story

Pushed higher by heavy rainfall, the Tolt Riverfcd_color_logo has surged to a Phase 2 flood alert level with minor flooding possible east of Carnation, while the Snoqualmie River remains at a Phase 3 flood alert level with flooding possible across portions of the Snoqualmie Valley. The King County Flood Warning Center opened at 6:15 p.m. on Monday, Oct. 21 to monitor rising river flows.

As of 8:45 p.m. on Oct. 21, Tolt River near Carnation was flowing at 3,680 cubic feet per second (CFS), slightly higher than the Phase 2 flood alert threshold of 3,500 CFS for the Tolt. At these flows, minor flooding would be expected in low-lying areas upstream of Carnation.

Meanwhile, the Snoqualmie River remains at a Phase 3 flood alert level. As of 8:45 p.m. on Oct. 21, the sum of the Snoqualmie River’s three forks was flowing at 23,460 CFS, well above the Phase 3 flood alert threshold of 20,000 CFS for that river. Floodwaters could overtop roads in the Snoqualmie Valley, requiring their temporary closure.

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 kingcounty.gov/flood.

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 kingcounty.gov/flood. 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 kingcountyfloodcontrol.org.