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King County Flood Warning Center issues Phase III flood alerts for Tolt, Snoqualmie rivers

Summary

Heavy rain from a potent late-winter storm continues to push the Tolt and Snoqualmie rivers higher, and the King County Flood Warning Center has issued a Phase III flood alert for both rivers, where moderate flooding is now possible.

Story

Heavy rain from a potent late-winter storm continues to push the Tolt and Snoqualmie rivers higher, and the King County Flood Warning Center has issued a Phase III flood alert for both rivers, where moderate flooding is now possible.

As of 4 a.m. on Sunday, March 9, the sum of the Snoqualmie River’s three forks was at 21,540 cubic feet per second (CFS), easily exceeding the Phase III flood alert threshold of 20,000 CFS for that river system. At this level, flooding of varied levels could be expected across the entire Snoqualmie Valley, with road closures possible.

Meanwhile, at 4 a.m. the Tolt River at Carnation recorded a flow of 5,350 CFS, slightly higher than the Phase III flood alert threshold of 5,000 CFS. At these flows, increased water depth and velocity could be expected in the San Souci neighborhood upstream of Carnation, including likely flooding across Tolt River Road Northeast in the San Souci neighborhood.

The Flood Warning Center, which opened at 12:30 a.m. on March 9, will remain open as long as flood conditions persist. 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 kingcounty.gov/flood.

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 six 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.

Updated information on flooding will also be posted on the King County website at kingcounty.gov, and via RPIN, the area's regional emergency information website at rpin.org.

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.

Questions or assistance with flooding on smaller streams or urban drainage problems can be called in to 206-296-1900 during business hours, or 206-296-8100 after hours or on weekends.

Problems on County maintained roads can be reported by calling 206-296-8100 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 http://www.kingcountyfloodcontrol.org/.