Dec. 6, 10:30 a.m.

We closed our Flood Warning Center at 10 a.m. on Wednesday, Dec. 6, following more than 30 hours of operations to monitor minor and moderate river flooding following yesterday’s potent rainstorm that sent river levels higher across the region.

Flows remain high on some rivers, including the lower White River, where controlled releases from Mud Mountain Dam on the King-Pierce county line have brought the White River to a Phase 2 flood alert level for low-lying areas downstream of the massive flood control dam. Minor flooding could occur later today in the City of Pacific near Government Canal and in Pacific City Park. No other flooding impacts are currently expected, and employees will continue to monitor conditions.

River levels elsewhere in King County have dropped significantly from yesterday’s peak flows. The Snoqualmie River reached a Phase 3 flood alert level yesterday, when floodwater flowed across fields and roads in the upper Snoqualmie River Valley. Those floodwaters have been slowly moving downstream throughout the morning.

Find real-time river level information at kingcounty.gov/flood. The Flood Warning Center is staffed 24/7 during flood events, serving as an information clearinghouse for the public and other agencies responsible for ensuring public safety during a flood event.

King County offers free access to KC Flood Alerts, an automated system with customized flood alerts on King County major river systems. When you sign up for KC Flood Alerts, you’ll get immediate notifications about pending high water via email, text or voicemail, giving subscribers with the maximum amount of warning about potential flooding.




Dec. 5, 8 a.m.

UPDATE – Snoqualmie River rises to Phase 3 flood level – road closures possible
As expected, the continued heavy rainfall has pushed the Snoqualmie River up to a Phase 3 flood alert threshold, with increased flood depths and an increased potential for water to cover roadways within the Snoqualmie Valley.

As of 8 a.m. on Tuesday, Dec. 5, the sum of the Snoqualmie River’s three forks was recorded at 20,670 cubic feet per second (CFS), eclipsing the Phase 3 flood alert threshold of 20,000 CFS. At these flows, we could expect to see flooding across the entire Snoqualmie Valley. Roads the could overtop include the Fall City – Carnation Road, portions of West Snoqualmie River Road, Northeast Tolt Hill Road, Novelty Flats Road, and others.

The rain-swollen Tolt River came close to reaching that Phase 3 moderate flood phase, too, but flows have eased over the past few hours and the Tolt remains at Phase 2 flood alert level. Find real-time river level information at kingcounty.gov/flood.

The King County Flood Warning Center remains open to monitor flood impacts, coordinate flood response activities, and answer your questions related to river flooding.

You can reach the Flood Warning Center during an activation at 206-296-8200 or 1-800-945-9263 to provide the latest information on flood conditions. There’s also a recorded message center with continuous updates of river gauge readings, flood phases, and other related information.

Dec. 5, 3 a.m.
King County’s Flood Warning Center opened at 2 a.m. on Tuesday, Dec. 5, to monitor minor flooding along the Snoqualmie and Tolt rivers following a long stretch of heavy rainfall from an atmospheric river that is sending river flows higher across the region.

As of 2:30 a.m. on Tuesday, Dec. 5, the sum of the Snoqualmie River’s three forks was recorded at 13,450 cubic feet per second (CFS) – that’s slightly higher than the Phase 2 flood alert threshold of 12,000 CFS. The Tolt River at Carnation was recorded at 4,300 CFS, which is well past the Phase 2 flood alert threshold of 3,500 CFS.

At these flows, minor flooding could occur in low-lying areas along both river courses. Weather forecasts are calling for minor to moderate flooding on additional King County rivers over the next few days as a series of potent rain systems sweep across western Washington.

King County Flood Warning Center employees are monitoring stream gauges and weather reports to provide updated information on river conditions as necessary. Find real-time river level information is available online at kingcounty.gov/flood. The Flood Warning Center is staffed 24/7 during flood events, serving as an information clearinghouse for the public and other agencies responsible for ensuring public safety during a flood event.

You can reach the Flood Warning Center during an activation at 206-296-8200 or 1-800-945-9263 to provide the latest information on flood conditions. There’s also a recorded message center with continuous updates of river gauge readings, flood phases, and other related information.

King County offers free access to KC Flood Alerts, an automated system with customized flood alerts on King County major river systems. When you sign up for KC Flood Alerts, you’ll get immediate notifications about pending high water via email, text or voicemail, giving subscribers with the maximum amount of warning about potential flooding.

We’ll provide updated information on flood conditions throughout the duration of this flood event – be sure to check back frequently for the latest details.