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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 Spring 2024. Existing AHPS content and features will be preserved and expanded within NWPS. The NWS is now accepting feedback on NWPS. Please visit for more information.

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Hydrograph River at a Glance Download
Bighorn River at Greybull Stage (ft)Flow (kcfs)Highest Observation: 82.43 ft at 1:00PM Dec 11, 2023GYBW4(plotting HGIRZ) Graph Created (3:04PM Dec 11, 2023)ObservedLatest observed value: 82.43 ft at 1:00 PM MST 11-Dec-2023. Flood Stage is 92 ft
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Tabular Data (UTC)
Tabular Data (MST)
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Datum: Not Available
NOTE: Stage measured manually and reported by river observer. No automated gauge on-site.

Reliability of the Forecast: Based on current and forecast river, weather and reservoir conditions

NOTE: Forecasts for the Bighorn River at Greybull are issued as needed during times of high water, but are not routinely available.

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Upstream Gauge - at Basin Upstream Gauge Downstream Gauge Downstream Gauge - near Kane
Flood Categories (in feet)
Major Flood Stage: 95
Moderate Flood Stage: 93.5
Flood Stage: 92
Action Stage: 90
Low Stage (in feet): -9999

Historic Crests
(1) 93.50 ft on 03/09/2014
(2) 91.90 ft on 02/22/2017
(3) 91.10 ft on 06/08/1991
(4) 90.50 ft on 06/11/2011
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 87.65 ft on 06/02/2018
(2) 89.06 ft on 03/10/2018
(3) 91.90 ft on 02/22/2017
(4) 93.50 ft on 03/09/2014
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:12
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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.
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If you notice any errors in the below information, please contact our Webmaster
95 Levee around Greybull will be overtopped causing widespread flooding.
92 Flood stage. Low lying flooding intensifies and becomes more widespread along southern areas of Greybull. Levee may be in danger of failing in many area with prolonged high flows. Corresponds to "7" reference point measured at staff gage under Highway 14 Bridge.
91.1 Record high stage (6/8/1991). Estimated flow: 20,000 - 22,000 cfs.
91 Water may begin to surge over low spots along the levee near the southern end of Greybull. Flooding expected along areas behind levee near southern areas of Greybull. Water will begin to surge against the rest of the levee throughout the town. Corresponds to "6" reference point measured at staff gage under Highway 14 Bridge.
90 Bankfull stage. Constant monitoring of levee is needed. Water begins to surge against base of levee near the south end of Greybull. Corresponds to "d" reference point measured at base of dike under Highway 14 Bridge.
80 Baseflow stage of the river (3880' elevation above sea level).
(1) Looking Upstream---High flows due to ice jam---late February 2017
(2) Looking Downstream---High flows due to ice jam---late February 2017
(3) Looking Upstream---Moderate Flow
(4) Looking Downstream---Moderate Flow
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Latitude: 44.488680° N, Longitude: 108.046980° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame
Gauge Height Flood Stage Uses
NWS stage 0 ft 92 ft 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 Not Available Not Available Older USGS topographic maps, NGVD29 benchmarks
MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks
Other Not Available Not Available  
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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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