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Web Portal Changes: In Spring 2024, the Advanced Hydrologic Prediction Service (AHPS) hosted at will be replaced by the National Water Prediction Service (NWPS) at a repurposed A preview of NWPS is available here, where you can see your station hydrograph by replacing SSSSS with the station 5-character id:

Flood Inundation Mapping: Experimental real-time flood Inundation mapping services for 10% of the United States are now available via the NWS Map Viewer. Additional products and geospatial services depicting River Forecast Center and National Water Model forecasts continue to be accessible as described in the StoryMap here.

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Hydrograph River at a Glance Download
Little Popo Agie River near Lander Stage (ft)Flow (cfs)USGS--Water Resources of the United StatesLPLW4(plotting HGIRG) Graph Created (2:04AM Mar 2, 2024)Flood Stage is 5.5 ft
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Tabular Data (UTC)
Tabular Data (MST)
XML Data
RSS Files
Datum: NGVD29
NOTE: Forecasts are not available for the Little Popo Agie River near Lander. Only observed stages are available for this point.
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Downstream Gauge Downstream Gauge - near Hudson
Flood Categories (in feet)
Major Flood Stage: 6.5
Moderate Flood Stage: 6
Flood Stage: 5.5
Action Stage: 5
Low Stage (in feet): -9999

Historic Crests
(1) 6.64 ft on 06/11/1963
(2) 6.42 ft on 06/11/1965
(3) 6.09 ft on 06/07/2017
(4) 5.95 ft on 06/12/1983
(5) 5.95 ft on 06/24/1977
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 4.76 ft on 06/08/2019
(2) 3.99 ft on 05/27/2018
(3) 6.09 ft on 06/07/2017
(4) 4.71 ft on 06/10/2016
(5) 5.73 ft on 05/07/2016
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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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
6.64 Record stage and flow---2,010 cfs (6/11/1963).
6.5 Major flooding of all areas of Hudson. Water may be near ranch homes 0.5 to 1,0 mile upstream especially along banks opposite of meandering cut banks.
6 Major flooding of homes in Hudson along northern section of town. Water begins to flood other parts of Hudson. Major agricultural flooding upstream and downstream of of gage.
5.5 Flood Stage. Moderate flooding of homes in northern end of Hudson along right bank. Minor agricultural flooding upstream and downstream of gage.
5 Bankfull stage. Homes in Hudson near the river along northern section of town begin to flood. Travel time of flood wave to Hudson is appx 8 to 10 hours.
(1) Looking Upstream---High Flow (near 2,000 cfs)---June 2010
(2) Looking Downstream---High Flow (near 2,000 cfs)---June 2010
(3) Looking Upstream---Moderate Flow
(4) Looking Downstream---Moderate Flow
(5) Looking Upstream---Low Flow
(6) Looking Downstream---Low Flow
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Latitude: 42.716400° N, Longitude: 108.643100° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame
Gauge Height Flood Stage Uses
NWS stage 0 ft 5.5 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 5436.49 ft 5441.99 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:

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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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