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King County Flood Warning Center issues Phase II flood alert for Green River


The King County Flood Warning Center has issued a Phase II flood alert for the Green River because of increased flows from heavy rainfall.


The King County Flood Warning Center has issued a Phase II flood alert for the Green River becauseFlood Control Zone District Logo of increased flows from heavy rainfall. Also, minor to moderate flood conditions persist along the Tolt and Snoqualmie rivers.

Flows on the Green River were expected to exceed 8,000 cubic feet per second (CFS) at the Auburn gage early Sunday afternoon, triggering the Phase II flood alert level from the Flood Warning Center, which has been open since 12:30 a.m. on Sunday, March 9 to closely monitor flood flows. At this level, only minor flooding is typically expected to occur in rural areas of the Green River upstream of Auburn.

Meanwhile, the Snoqualmie River remains at a Phase III flood alert level, with moderate flooding of varied levels occurring across much of the Snoqualmie River Valley. As of 12:15 p.m., the sum of the Snoqualmie River’s three forks was at 21,760 CFS, down from the 25,300 CFS level recorded at 8:15 a.m. Sunday.

Flows on the Tolt River at Carnation have also begun to drop. As of 12:15 p.m. Sunday, the Tolt River gage at Carnation was at 4,460 CFS, after a peak of 5,720 CFS at 5:15 a.m. Sunday. 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 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

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 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, and via RPIN, the area's regional emergency information website 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.

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