Skip to main content
King County logo


Natural Resources and Parks
Public Affairs

King County Flood Warning Center issues Phase 3 alert as rain-swollen Snoqualmie River rising higher


The King County Flood Warning Center has issued a Phase 3 flood alert for the Snoqualmie River, 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 flooding along the river following sustained rainfall across much of King County.


Persistent rainfall has lifted the Snoqualmie River to a fcd_color_logo Phase 3flood alert level with more flooding expected across low-lying areas of the Snoqualmie Valley, according to the King County Flood Warning Center, which opened at 6:15 p.m. on Monday, Oct. 21 to monitor rising river flows.

As of 7:45 p.m. on Oct. 21, the sum of the Snoqualmie River’s three forks was reported flowing at 20,490 cubic feet per second (CFS), surpassing the Phase 3 flood alert threshold of 20,000 CFS.

At these flows, flooding of varied depths could occur in the Snoqualmie Valley could be expected. Roads could overtop with floodwaters, and motorists are reminded to heed all emergency road signs.

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

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 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.

# # #

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