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King County Flood Warning Center opens to monitor minor flooding along Tolt River


The King County Flood Warning Center opened at 2:45 a.m. on Friday, Dec. 20, to minor flooding along the Tolt River, as a powerful atmospheric river brought heavy rainfall to a wide swath of western Washington.


The King County Flood Warning Center opened at 2:45 a.m.fcd_color_logo on Friday, Dec. 20, to monitor rising flows on the Tolt River from a strong storm that brought significant rainfall to the region.

As of 3 a.m. on Dec. 20, the Tolt River near Carnation was reported flowing at 3,760 cubic feet per second (CFS), slightly higher than the Phase 2 flood alert threshold of 3,500.

At these flows, minor flooding could occur in low-lying areas along the Tolt River upstream of Carnation.

Flood Warning Center employees will monitor stream gauges 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 gauge 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 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