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Flooding Services

King County, Washington

Green River Flooding Information
USGS gage data, map, and alert phases, and recent high flows

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USGS Gage Name

Time, Date



Flow Change

Howard A Hanson Reservoir (external link) 8:00 AM, 8/29/2014 1153.60 n/a -0.02 (stage, in feet)
Green River below Howard Hanson Dam (external link) 8:00 AM, 8/29/2014 4.65 378 0
Green River near Palmer (external link) 8:00 AM, 8/29/2014 3.89 211 0
Big Soos Creek above Hatchery (external link) 8:15 AM, 8/29/2014 2.89 34 +2
Green River near Auburn (external link) 8:45 AM, 8/29/2014 53.38 378 +5
Green River at 200th St in Kent (external link) 8:00 AM, 8/29/2014 11.23 339 +0.01 (stage, in feet)


This data was requested from USGS at 8/29/2014 9:02:11 AM.

The next request for USGS data is expected in approximately 9 minutes from when this page was loaded.

c.f.s. = cubic feet per second.
King County provides funding to the United States Geological Survey (USGS) to support the operation and maintenance of river and stream gages and related systems. The term "gage" is defined as an instrument for measuring or testing. USGS uses the term "streamgage" to describe their equipment that obtains estimates of the amount of water flowing in streams and rivers. More information about USGS streamgages

Howard A Hanson Reservoir: Stage 1153.60 ft. at 8:00 AM (provisional)Green River below Howard Hanson Dam: Flow 378.00 c.f.s. at 8:00 AM (provisional)Green River near Palmer: Flow 211.00 c.f.s. at 8:00 AM (provisional)Big Soos Creek above Hatchery: Flow 34.00 c.f.s. at 8:15 AM (provisional)Green River near Auburn: Flow 378.00 c.f.s. at 8:45 AM (provisional)Green River at 200th St in Kent: Flow 339.00 c.f.s. at 8:00 AM (provisional)
Flood Phase Information
Phase Green River gage at Auburn (measured or expected flow) * Description Condition
1 5,000 c.f.s. Internal Alert  
2 7,000 c.f.s. Minor Flooding Lowland flooding in valley upstream of Auburn.
3 9,000 c.f.s. Moderate Flooding Flooding of varied depths occurs in valley upstream of Auburn and lower Mill Creek basin. SE Green Valley Rd and West Valley Rd may overtop.
4 12,000 c.f.s. Extreme Flooding Critical flood control levees may weaken from saturation. Sudden changes in flood conditions are possible, especially in levee-protected areas. These changes may include rapidly rising water, widespread inundation, road closures, and utility disruptions. Be alert and prepare to respond quickly.
* Phase is determined by current Auburn gage reading or the expected flow based on Howard Hanson dam operations information from the U.S. Army Corps of Engineers.

Green River - Duwamish River gage map - flooding
Recent High Flow Data:
Green River at Auburn
January 18, 2011 10,400 c.f.s.
December 13, 2010 9,720 c.f.s.
January 9, 2009 11,100 c.f.s.
November 7, 2006 12,200 c.f.s.
February, 1996 12,400 c.f.s.
November, 1995 11,200 c.f.s.
November, 1990 11,500 c.f.s.

National Weather Service: Green River/Howard Hanson Dam Monitoring (external link)

Additional USGS gages: (external links)

Additional U.S. Army Corps of Engineers gage data: (external link)

U.S. Army Corps of Engineers access for the following gages

  • Howard Hanson Dam
  • Howard Hanson Dam Tailwater
  • Green River near Palmer
  • Green River near Auburn
  • Green River near Lester
  • Big Soos Creek above Hatchery, near Auburn
  • Newaukum Creek near Black Diamond

Northwest River Forecast Center data and forecast information

Howard Hanson Reservoir (external link)

More Green-Duwamish River Flood Related Information

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