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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
Henrys Fork at Manila Stage (ft)Flow (kcfs)GYBW4(plotting HGIRZ) Graph Created (10:34AM Sep 29, 2023)Flood Stage is 92 ft
About this graph
Tabular Data (UTC)
Tabular Data (MDT)
XML Data
RSS Files
Datum: NGVD29
Reliability of the Forecast: Based on unobstructed flow

NOTE: Forecasts for the Henrys Fork at Manila are issued routinely year-round.

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Flood Categories (in feet)
Major Flood Stage: 0
Moderate Flood Stage: 0
Flood Stage: 7
Action Stage: 6.5
Low Stage (in feet): -9999

Historic Crests
(1) 9.65 ft on 06/08/1957
(2) 9.42 ft on 07/15/1959
(3) 8.47 ft on 06/09/1955
(4) 8.17 ft on 05/27/1956
(5) 7.40 ft on 07/29/1982
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 5.07 ft on 08/19/2021
(2) 5.56 ft on 06/01/2020
(3) 5.97 ft on 06/15/2019
(4) 5.89 ft on 05/12/2018
(5) 5.47 ft on 06/06/2017
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
Currently none available.
Zoom Level:11
KML Image
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
9.65 Record stage---(6/8/1957).
8 A few houses downstream may have standing water near them. Widespread pastureland flooding.
7.19 Record flow---6,750 cfs (8/3/1936).
7 Flodd stage. Minor flooding of pastureland upstream and downstream of gage.
6.5 Bankfull stage.
(1) Looking Upstream---High Flow (near 2,400 cfs)---June 2010
(2) Looking Downstream--High Flow (near 2,400 cfs)---June 2010
(3) Looking Upstream---Moderate Flow
(4) Looking Downstream---Moderate Flow
About This Location Collapse

Latitude: 41.010900° N, Longitude: 109.673690° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame
Gauge Height Flood Stage Uses
NWS stage 0 ft 7 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 6060.0 ft 6067.0 ft 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:

Additional Information Collapse
Flood categories currently unreliable due to gage relocation.
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Hydrologic Resources Additional Resources
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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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