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Web Portal Changes: The Advanced Hydrologic Prediction Service (AHPS) hosted at will be replaced by the National Water Prediction Service (NWPS), with a target of March 2024. Existing AHPS content and features will be preserved and expanded within NWPS.

Experimental National Water Center Products: Flood Inundation Mapping services are now available for 10% of the U.S. population. Please visit for more information. The National Hydrologic Discussion, Area Hydrologic Discussion, Flood Hazard Outlook, and real-time geospatial services depicting River Forecast Center and National Water Model forecasts, continue to be accessible via the URL above, as described in the StoryMap here.

Hydrograph River at a Glance Download
Gros Ventre River at Zenith Stage (ft)Forecast: 18.02 ft 12:00AM Oct 01, 2023Forecast: 18.02 ft 6:00AM Oct 01, 2023Forecast: 18.05 ft 12:00PM Oct 01, 2023Forecast: 18.11 ft 6:00PM Oct 01, 2023Highest Forecast: 18.18 ft 12:00AM Oct 02, 2023Forecast: 18.17 ft 6:00AM Oct 02, 2023Forecast: 18.13 ft 12:00PM Oct 02, 2023Forecast: 18.1 ft 6:00PM Oct 02, 2023Forecast: 18.12 ft 12:00AM Oct 03, 2023Forecast: 18.13 ft 6:00AM Oct 03, 2023Forecast: 18.14 ft 12:00PM Oct 03, 2023Forecast: 18.13 ft 6:00PM Oct 03, 2023Forecast: 18.13 ft 12:00AM Oct 04, 2023Forecast: 18.1 ft 6:00AM Oct 04, 2023Forecast: 18.08 ft 12:00PM Oct 04, 2023Forecast: 18.05 ft 6:00PM Oct 04, 2023Forecast: 18.06 ft 12:00AM Oct 05, 2023Forecast: 18.04 ft 6:00AM Oct 05, 2023Forecast: 18.03 ft 12:00PM Oct 05, 2023Forecast: 18.03 ft 6:00PM Oct 05, 2023USGS--Water Resources of the United StatesGVZW4(plotting HGIRG) Graph Created (11:19PM Sep 30, 2023)ObservedForecast (issued 9:27AM Sep 30)Latest observed value: 17.99 ft at 10:15 AM MDT 25-Sep-2023.
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Tabular Data (UTC)
Tabular Data (MDT)
XML Data
RSS Files
Datum: NGVD29
Reliability of the Forecast: Based on unobstructed flow

NOTE: Forecasts for the Gros Ventre River at Zenith are issued routinely year-round.

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Upstream Gauge - at Kelly Upstream Gauge
Flood Categories (in feet)
Major Flood Stage: 0
Moderate Flood Stage: 0
Flood Stage: 0
Action Stage: 26
Low Stage (in feet): -9999

Historic Crests
(1) 6,170 cfs on 06/06/1997
(2) 5,240 cfs on 06/10/1996
(3) 4,850 cfs on 07/08/2011
(4) 4,780 cfs on 06/17/2017
(5) 4,510 cfs on 06/05/2017
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 1,350 cfs on 06/06/2021
(2) 3,040 cfs on 06/01/2020
(3) 2,720 cfs on 06/08/2019
(4) 3,090 cfs on 05/26/2018
(5) 4,780 cfs on 06/17/2017
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
Currently none available.

For more information on your flood risk go to

Zoom Level:14
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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.
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If you notice any errors in the below information, please contact our Webmaster
26 Bankfull stage. Near top of levees.
23 Record stage and flow---6,170 cfs (6/6/1997).
(1) Looking Upstream--High Flows (near 4,000 cfs)--early June 2017
(2) Looking Downstream--High Flows (near 4,000 cfs)--early June 2017
(3) Looking Upstream---Moderate Flow
(4) Looking Downstream---Moderate Flow
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Latitude: 43.557760° N, Longitude: 110.763080° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame
Gauge Height Flood Stage Uses
NWS stage 0 ft Not Available Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps
Vertical Datum Elevation
(gauge height = 0)
(gauge height = flood stage)
Elevation information source
NAVD88 Not Available Not Available Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29 6260.0 ft Not Available Older USGS topographic maps, NGVD29 benchmarks
MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks
Other Not Available Not Available  

Current/Historical Observations:

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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
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Riverton Weather Forecast Office
12744 West U.S. Highway 26
Riverton, WY 82501
(307) 857-3898
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