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Hydrograph River at a Glance Download
Middle Fork Popo Agie River at Sinks Canyon Stage (ft)Flow (cfs)LANW4(plotting HGIRG) Graph Created (4:19AM Oct 24, 2016)ObservedLatest observed value: 2.49 ft at 3:15 AM MDT 24-Oct-2016. Flood Stage is 6.5 ft
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Datum: Not Available
NOTE: Gauge readings not available during the winter months.

Reliability of the Forecast: Based on unobstructed flow

NOTE: Forecasts for the Middle Fork Popo Agie River at Sinks Canyon are issued as needed during times of high water, but are not routinely available.

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Downstream Gauge Downstream Gauge - near Lander
Flood Categories (in feet)
Major Flood Stage: 8
Moderate Flood Stage: 7.5
Flood Stage: 6.5
Action Stage: 5.5
Low Stage (in feet): 0

Historic Crests
(1) 7.69 ft on 06/16/1963
(2) 7.50 ft on 06/07/2010
(3) 6.55 ft on 06/15/1995
(4) 6.48 ft on 06/05/1971
(5) 6.40 ft on 06/10/1965
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(P): Preliminary values subject to further review.

Recent Crests
(1) 6.14 ft on 06/10/2016 (P)
(2) 5.09 ft on 06/03/2015
(3) 4.88 ft on 05/28/2014
(4) 4.21 ft on 06/11/2013
(5) 4.10 ft on 06/04/2012
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(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
7.69 Record stage and flow---4,180 cfs (6/16/1963).
7.5 Water enters City Park area and begins moving down Fremont and south 3rd Streets.
6.5 Flood stage. Low lying property along Popo Agie Estates Subdivision south of Lander is under water. Severe bank erosion possible along Middle Fork Popo Agie River from City Park to the Main Street Bridge. Constant sandbagging is needed.
6.2 Cautionary sandbagging is needed along the river near City Park and 2nd Street.
6 Water over low lying area immediately downstream of gage. Lander emergency officials begin notifying land owners downstream of gage that major flooding may occur within 12 to 24 hours if river continues to rise.
5.5 Bankfull stage downstream of gage.
4.2 Flow into the overflow channel from the Sinks to the Rise begins.
(1) Looking Upstream---Moderate Flow
(2) Looking Downstream---Moderate Flow
(3) Looking Upstream---Low Flow
(4) Looking Downstream---Low Flow
(5) Sinks Canyon---High Flow (near 3,800 cfs)---June 2010
(6) SInks Canyon---Low Flow
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Latitude: 42.757500° N, Longitude: 108.798611° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame
Gauge Height Flood Stage Uses
NWS stage 0 ft 6.5 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 6155 ft 6161.5 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: 13-Aug-2015 1:55 AM
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