Rivers in Wyoming
Snake River at Flagg Ranch
Below flood stage
2.39ftStage
Observed Mon, Sep 21, 6:30 PM MDT
- Flood stage
- 10.00 ft
- Forecast crest
- 2.39 ftWed, Sep 23, 12:00 PM MDT
- Record crest
- 10.75 ft1996
Flood stages and impacts
| Category | Stage |
|---|---|
| Moderate flood | 11.00 ft |
| Minor flood | 10.00 ft |
| Action | 9.00 ft |
- 11.00 ftLower sections of downstream parking lot may be under water. Flagg Ranch campgrounds still not affected.
- 10.75 ftRecord stage and flow---15,000 cfs (6/5/1996).
- 10.00 ftFlood stage. Minor flooding along lower sections of parking lot 300 feet downstream of gage on right bank.
- 9.00 ftBankfull stage.
Flood outlook
Chance of flooding, September to November
| Category | Chance |
|---|---|
| Minor flooding | Under 5% |
| Moderate flooding | Under 5% |
| Major flooding | -99900% |
The three-month chances are the River Forecast Centers’ long-range flood outlook, issued September 21, 2026.
Crest history
38 crests on NOAA’s list since 1984.
| # | Date | Stage |
|---|---|---|
| 1 | June 5, 1996 | 10.75 ft |
| 2 | June 5, 1997 | 10.16 ft |
| 3 | June 6, 1986 | 9.41 ft |
| 4 | June 6, 1995 | 9.30 ft |
| 5 | June 24, 2011 | 9.25 ft |
| 6 | May 31, 2009 | 9.13 ft |
| 7 | May 28, 2014 | 9.03 ft |
| 8 | June 5, 2017 | 8.74 ft |
| 9 | May 22, 2006 | 8.72 ft |
| 10 | May 25, 1991 | 8.71 ft |
| 11 | May 21, 1993 | 8.60 ft |
| 12 | May 31, 2002 | 8.59 ft |
| 13 | May 28, 1999 | 8.55 ft |
| 14 | May 30, 1998 | 8.55 ft |
| 15 | June 1, 2020 | 8.52 ft |
| 16 | May 29, 2003 | 8.46 ft |
| 17 | June 4, 2010 | 8.46 ft |
| 18 | May 20, 2005 | 8.42 ft |
| 19 | May 31, 1984 | 8.39 ft |
| 20 | May 26, 2018 | 8.29 ft |
| 21 | May 19, 2008 | 8.22 ft |
| 22 | May 27, 1985 | 8.16 ft |
| 23 | May 15, 2013 | 8.10 ft |
| 24 | May 26, 2000 | 7.71 ft |
| 25 | May 13, 1994 | 7.62 ft |
Most recent crests
- May 19, 2021: 6.37 ft
- June 1, 2020: 8.52 ft
- May 17, 2019: 7.52 ft
- May 26, 2018: 8.29 ft
- June 5, 2017: 8.74 ft
- May 9, 2016: 6.54 ft
- May 2, 2015: 6.17 ft
- May 28, 2014: 9.03 ft
- May 15, 2013: 8.10 ft
- June 4, 2012: 7.49 ft
Nearby
Upstream, downstream and the gauges around this one.
What this means
Forecasts by the Northwest River Forecast Center. Forecasts are issued routinely year-round.
Sources
Stage, flood stages, impacts and crest history from NOAA’s National Water Prediction Service. Streamflow and the daily record from the U.S. Geological Survey.