Skip to main content
King County logo


Natural Resources and Parks
Public Affairs

King County Flood Warning Center: Steady rain sends Tolt River up to Phase 3 flood alert


The King County Flood Warning Center has issued a Phase 3 flood alert for the Tolt River, where heavy rainfall could result in increased moderate flooding along the river upstream of Carnation.


fcd_color_2018Pushed higher by steady rainfall, the Tolt River has reached a Phase 3 flood alert level, with increased moderate flooding possible upstream of Carnation, according to the King County Flood Warning Center, which has been monitoring flooding since 8 a.m. on Friday, Nov. 2.

As of 11 a.m., the Tolt River recorded a flow of 6,210 cubic feet per second (CFS), easily exceeding the Phase 3 flood alert threshold of 5,000 CFS.
At these flows, floodwaters could inundate areas of the San Souci neighborhood along the river east of Carnation. Some roads could overtop with floodwaters and be closed.

A flood patrol crew has been dispatched to the Tolt River to look for any problems with levees and other flood-protection structures along the rain-swollen river. 

Meanwhile, the Snoqualmie River remains at a Phase 2 flood alert level, with minor flooding possible in low-lying areas of the Snoqualmie Valley. As of 11 a.m., the sum of the Snoqualmie River’s three forks was reported flowing at 13,930 CFS, which is slightly lower than the 9:30 a.m. sum of the forks flow.

Flood Warning Center employees will continue monitoring stream gages, weather reports, and other information sources. 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