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


The King County Flood Warning Center has issued a Phase 3 flood alert for the Tolt River, with moderate flooding possible upstream of Carnation. The Flood Warning Center has also issued a Phase 2 flood alert for the Snoqualmie River, where minor flooding is now possible in low-lying areas of the Snoqualmie Valley.


The King County Flood Warning Center has issued a fcd_color_logoPhase 3 flood alert for the Tolt River, with moderate flooding possible along the river east of Carnation. A Phase 2 flood alert has been issued for the Snoqualmie River, where minor flooding is possible along low-lying areas of the river valley.

As of 4:30 a.m., the Tolt River near Carnation was flowing at 5,060 cubic feet per second (CFS), slightly higher than the Phase 3 flood alert threshold of 5,000 CFS. At these flows, moderate widespread flooding could be expected along the Tolt River upstream of Carnation. Some road closures could occur.

On the Snoqualmie River at 4:30 a.m., the sum of the river’s three forks was recorded at 12,387 CFS – just above the Phase 2 flood alert threshold of 12,000 CFS for the Snoqualmie. At these flows, typically only minor flooding in low-lying areas would be expected, with minimal impacts to roadways.

The Flood Warning Center opened at 2:45 a.m. on Friday, Dec. 20, as an atmospheric river brought several hours of heavy rain to King County, leading to rising stream levels across the region. 

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 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