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Advanced Hydrologic Prediction Service
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This probabilistic forecast is issued by the Missouri Basin River Forecast Center.
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About this graph
Forecasts are not available for the Belle Fourche River at Keyhole Reservoir. Only observed stages are available for this point.
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Zoom Level:14
Flood Categories (in feet)
Major Flood Stage: 0
Moderate Flood Stage: 0
Flood Stage: 0
Action Stage: 4099.3
Low Stage (in feet): -9999

Historic Crests
(1) 4,101.98 ft on 03/28/2019
(2) 4,100.38 ft on 05/21/1978
(3) 4,099.58 ft on 03/14/2020
(4) 4,099.55 ft on 06/27/2015
(5) 4,099.45 ft on 03/17/2012
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 4,092.90 ft on 06/14/2022
(2) 4,095.35 ft on 10/04/2020
(3) 4,099.58 ft on 03/14/2020
(4) 4,101.98 ft on 03/28/2019
(5) 4,096.59 ft on 06/29/2018
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) 4,046.35 ft on 03/09/1955
Show More Low Water Records
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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.
Flood Impacts & Photos Collapse
If you notice any errors in the below information, please contact our Webmaster
4134 Dam crest elevation.
4128.7 Normal water surface elevation.
4111.5 Top of flood control.
4099.3 Spillway crest elevation. Top of active conservation capacity.
4051 Top of inactive conservation pool.
4036 Top of dead storage pool.
(1) Keyhole Dam
(2) Keyhole Reservoir
(3) Spillway

Other Real-time and/or Archive Data Sources:

Collaborative Agencies Collapse
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
Rapid City Weather Forecast Office
300 East Signal Drive
Rapid City, SD 57701-3800
(605) 341-7531
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Page last modified: 2-Nov-2020 7:28 PM
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