Gulkana River at Sourdough, AK
River level and flood forecast · Copper River County
The river is 4.7 ft below flood stage (11 ft).
Forecast to hold near 6.3 ft through Thu, Oct 15, 6 AM.
Flow: 1,080 cubic feet per second (USGS).
The last 7 days and the forecast
NWS forecast issued Mon, Oct 12, 8:31 PM. Forecasts change as rain falls and as upstream water arrives.
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Flood stages
| Flood stage | 11 ft |
| Action stage | 9.5 ft |
| Record crest (May 7, 1976) | 16.03 ft |
What floods at each level
From the National Weather Service, highest first.
- 12.5 ftStage associated with flow (16900 cfs) having a recurrence interval of >50 years; major flooding would be expected on this and nearby streams
- 12 ftStage associated with flow (15200 cfs) having a recurrence interval of 20-40 years; moderate flooding would be expected on this and nearby streams
- 11 ftStage associated with a flow (11900 cfs) having a recurrence interval of ~10 years; minor flooding would be expected on this and nearby streams
- 9.5 ftBankfull -- stage associated with flow (7400 cfs) having a recurrence interval of ~2 years
Highest crests on record
- 16.03 ft — May 7, 1976
- 14.64 ft — May 5, 2009
- 14.62 ft — May 30, 2013
- 12 ft — October 10, 2006
- 11.26 ft — September 12, 1990
Recent crests: 10.09 ft (June 24, 2020) · 8.57 ft (May 9, 2019) · 10.75 ft (June 13, 2018) · 8.85 ft (May 2, 2017) · 8.52 ft (July 26, 2016)
Up and down the river, and nearby
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (GRSA2); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.