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Green River Flooding Information

USGS gage data, map, alert phases, and recent high flows

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New: Click on a gage name for graph and additional data.

USGS Gage Name

Time, Date

Stage
(feet)

Flow
(cfs)

Flow Change
(cfs/hr)

Howard A Hanson Reservoir 4:00 PM, 10/4/2023 1,129.80 n/a -0.02 (stage, in feet)
Green River below Howard Hanson Dam 4:30 PM, 10/4/2023 4.81 397 +3
Green River near Palmer 5:00 PM, 10/4/2023 4.31 324 0
Big Soos Creek above Hatchery 4:15 PM, 10/4/2023 2.78 44 -1
Green River near Auburn 4:45 PM, 10/4/2023 57.17 486 -3
Green River at 200th St in Kent 4:15 PM, 10/4/2023 12.10 567 -0.02 (stage, in feet)

* Gage data currently unavailable.

Notes:

This data was requested from USGS at 10/4/2023 5:15:08 PM.

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

cfs = 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
Flood Phase Information
Phase Green River gage at Auburn (measured or expected flow) * Description Condition
1 5,000 cfs Internal Alert  
2 7,000 cfs Minor Flooding Lowland flooding in valley upstream of Auburn.
3 9,000 cfs 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 cfs Severe 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
February 7, 2020 11,700 cfs*
December 8, 2015 10,900 cfs
January 18, 2011 10,400 cfs
January 9, 2009 11,100 cfs
November 7, 2006 12,200 cfs
February, 1996 12,400 cfs
November, 1995 11,200 cfs
November, 1990 11,500 cfs

*provisional data

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

» Return to the The Flood Warning System Page
» Visit King County Flooding Services
» See other Green River Topics