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Controlled dam releases send White River to Phase 2 flood alert level - other King County rivers remain high

Summary

The King County Flood Warning Center, which opened on Tuesday, Nov. 21, has issued a Phase 2 flood alert for the White River, where planned releases from a flood-control dam could result in minor flooding in low-lying areas along the river. Flows remain high and swift on rivers across King County following several days of heavy rain.

Story

The King County Flood Warning Center, which openedFlood Control Zone District Logo at 7:15 p.m. on Tuesday, Nov. 21 to monitor rain-swollen rivers across the county, has issued a Phase 2 flood alert for the White River in the Auburn-Pacific area, where minor flooding could occur in low-lying areas.

Planned releases from a flood-control dam on the White River in the Cascade foothills have slowly increased river flows downstream of the dam. As of 12:30 p.m. on Thursday, Nov 23, the White River at Mud Mountain Dam was flowing at 5,050 cubic feet per second (CFS), which is slightly higher than the Phase 2 flood alert threshold of 5,000 CFS.
 
At these flows, minor overbank flooding could occur upstream of the A Street Bridge in Auburn. Minor flooding could also occur in Pacific near Government Canal. Extensive temporary flood protection barriers are in place to protect Pacific.

Other area rivers are flowing fast and high, including the Snoqualmie River, where moderate and widespread flooding continues.

As of 12:30 p.m. on Thursday, the sum of the Snoqualmie River’s three forks was flowing at 20,420 CFS, slightly higher than the Phase 3 flood alert threshold of 20,000 CFS.

Flood Warning Center employees will continue to 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 kingcounty.gov/flood.

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 kingcounty.gov/flood. 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.

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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 kingcountyfloodcontrol.org.