Big Sandy River (WY) above Big Sandy Reservoir, WY
River level and flood forecast · Sublette County
Normal3.7 ftas of Mon 1 PM
The river is 8.3 ft below flood stage (12 ft).
Forecast to rise to 4.2 ft Tue 2 AM, below the 12 ft flood stage.
Flow: 45 cubic feet per second (USGS).
The last 7 days and the forecast
NWS forecast issued Mon, Oct 12, 11:53 AM. Forecasts change as rain falls and as upstream water arrives.
Flood stages
| Major flood stage | 14 ft |
| Moderate flood stage | 13 ft |
| Flood stage | 12 ft |
| Action stage | 10 ft |
| Record crest (June 3, 1986) | 8.46 ft |
What floods at each level
From the National Weather Service, highest first.
- 14 ftMajor Flood Stage. Flood Plain Full. Left Bank likely seeing significant errosion.
- 13 ftModerate Flood Stage. Water Tops embankment by 1 ft. Gage equipment likely damaged or destroyed and embankment likely compromised.
- 12 ftMinor Flood Stage. Top of embankment.
- 10 ftBankfull stage. Action Stage. Water reaches the top of staff gage on left bank flume structure.
- 8.46 ftRecord stage and flow---1,890 cfs (6/3/1986).
Highest crests on record
- 8.46 ft — June 3, 1986
- 8.45 ft — June 17, 1995
- 8.1 ft — June 9, 1972
- 8.09 ft — July 2, 2011
- 8.08 ft — June 12, 1965
Recent crests: 5.08 ft (June 7, 2021) · 5.31 ft (June 8, 2020) · 5.08 ft (June 7, 2020) · 5.54 ft (June 9, 2019) · 5.5 ft (June 19, 2018)
Up and down the river, and nearby
- New Fork River near Big Piney, WY
- Green River (WY-UT-CO) near La Barge, WY
- Green River (WY-UT-CO) below Fontenelle Dam, WY
- Boulder Creek below Boulder Lake near Boulder, WY
- Boulder Creek above Boulder Lake near Boulder, WY
- Fontenelle Creek near Herschler Ranch, WY
- Pine Creek above Fremont Lake, WY
- Lake Creek below Willow Lake, near Cora, WY
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (BSRW4); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.