King County Flood Warning Center opens to monitor possible minor flooding on Snoqualmie River following heavy rainfall

Oct. 31 – 2 a.m.
The first strong rainstorm of the season is sending river flows higher across the region, and King County’s Flood Warning Center opened at 1:30 a.m. on Monday, Oct. 31, to monitor minor flooding along the Snoqualmie River.

As of 1:30 a.m. on Monday, the sum of the Snoqualmie River’s three forks was recorded at 12,492 cubic feet per second (CFS); that’s slightly higher than the Phase 2 flood alert threshold of 12,000 CFS. At these flows, minor flooding could occur in low-lying areas along the Snoqualmie River.

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

While flows are rising on rivers and streams across King County as a result of the steady rainfall, no other rivers are expected to flood as a result of this storm.

During river flooding events, employees at the Flood Warning Center employees can be reached 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 everyone 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.

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