Skip to main content
King County logo


Natural Resources and Parks
Public Affairs

Snoqualmie River up to Phase 3 flood alert as rain continues to push King County river flows higher


The King County Flood Warning Center has issued a Phase 3 flood alert for the Snoqualmie River, with moderate flooding likely across portions of the Snoqualmie Valley. A Phase 3 flood alert remains in effect for the Tolt River, which spilled its banks in the early hours of Friday, Dec. 20.


The King County Flood Warning Center has issued afcd_color_logo Phase 3 flood alert for the Snoqualmie River, with moderate flooding possible in the Snoqualmie Valley. The Tolt River remains at a Phase 3 flood alert level, with flooding possible along the river east of Carnation.

As of 12:45 p.m., the sum of the Snoqualmie River’s three forks was recorded at 20,460 cubic feet per second (CFS), just above the Phase 3 flood alert threshold of 20,000 CFS. At these flows, flooding of varied depth could occur across the Snoqualmie Valley, with the possibility of overtopped roads. 

Flows along the Tolt River have receded slightly from earlier today, but still remain at Phase 3 flood alert level. As of 12:45 p.m., the Tolt River near Carnation was flowing at 5,210 CFS, slightly higher than the Phase 3 flood alert threshold of 5,000 CFS. Floodwaters could be expected across Tolt River Road Northeast near the San Souci neighborhood east of Carnation.

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.

# # #

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