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This probabilistic forecast is issued by the Northwest River Forecast Center.
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About this graph
Forecasts for the Snake River at Flagg Ranch are issued routinely year-round.
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Downstream Gauge Downstream Gauge - below Jackson Dam
Zoom Level:11
Flood Categories (in feet)
Major Flood Stage: 0
Moderate Flood Stage: 11
Flood Stage: 10
Action Stage: 9
Low Stage (in feet): -9999

Historic Crests
(1) 10.75 ft on 06/05/1996
(2) 10.16 ft on 06/05/1997
(3) 9.41 ft on 06/06/1986
(4) 9.30 ft on 06/06/1995
(5) 9.25 ft on 06/24/2011
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(P): Preliminary values subject to further review.

Recent Crests
(1) 6.37 ft on 05/19/2021
(2) 8.52 ft on 06/01/2020
(3) 7.52 ft on 05/17/2019
(4) 8.29 ft on 05/26/2018
(5) 8.74 ft on 06/05/2017
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
Currently none available.
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Gauge LocationGauge Map Marker
Latitude/Longitude Disclaimer: The gauge location shown in the above map is the approximate location based on the latitude/longitude coordinates provided to the NWS by the gauge owner.
Flood Impacts & Photos Collapse
If you notice any errors in the below information, please contact our Webmaster
11 Lower sections of downstream parking lot may be under water. Flagg Ranch campgrounds still not affected.
10.75 Record stage and flow---15,000 cfs (6/5/1996).
10 Flood stage. Minor flooding along lower sections of parking lot 300 feet downstream of gage on right bank.
9 Bankfull stage.
(1) Looking Upstream---Low Flow
(2) Looking Downstream---Low Flow

Other Real-time and/or Archive Data Sources:

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The National Weather Service prepares its forecasts and other services in collaboration with agencies like the US Geological Survey, US Bureau of Reclamation, US Army Corps of Engineers, Natural Resource Conservation Service, National Park Service, ALERT Users Group, Bureau of Indian Affairs, and many state and local emergency managers across the country. For details, please click here.
NWS Information
National Weather Service
Riverton Weather Forecast Office
12744 West U.S. Highway 26
Riverton, WY 82501
(307) 857-3898
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Page last modified: 2-Nov-2020 7:28 PM
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