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Hydrograph River at a Glance Download
Grand River (SD) at Shadehill Reservoir Pool (ft)Observed: 2270.99 ft at 6:15AM May 26, 2023Observed: 2270.98 ft at 6:30AM May 26, 2023Observed: 2270.98 ft at 6:45AM May 26, 2023Observed: 2270.99 ft at 7:00AM May 26, 2023Observed: 2270.98 ft at 7:15AM May 26, 2023Observed: 2270.98 ft at 8:30AM May 26, 2023Observed: 2270.98 ft at 8:45AM May 26, 2023Observed: 2270.98 ft at 9:00AM May 26, 2023Observed: 2270.98 ft at 9:15AM May 26, 2023Observed: 2270.99 ft at 9:30AM May 26, 2023Observed: 2270.98 ft at 9:45AM May 26, 2023Observed: 2270.99 ft at 10:00AM May 26, 2023Observed: 2270.99 ft at 10:15AM May 26, 2023Observed: 2270.99 ft at 10:30AM May 26, 2023Observed: 2270.99 ft at 10:45AM May 26, 2023Observed: 2270.99 ft at 11:00AM May 26, 2023Observed: 2270.99 ft at 11:15AM May 26, 2023Observed: 2270.99 ft at 11:30AM May 26, 2023Observed: 2270.99 ft at 11:45AM May 26, 2023Observed: 2270.99 ft at 12:00PM May 26, 2023Observed: 2270.99 ft at 12:15PM May 26, 2023Observed: 2270.99 ft at 12:30PM May 26, 2023Observed: 2270.99 ft at 12:45PM May 26, 2023Observed: 2271 ft at 1:00PM May 26, 2023Observed: 2270.99 ft at 1:15PM May 26, 2023Observed: 2270.99 ft at 1:30PM May 26, 2023Observed: 2270.99 ft at 1:45PM May 26, 2023Observed: 2271 ft at 2:00PM May 26, 2023Observed: 2270.99 ft at 2:15PM May 26, 2023Observed: 2270.99 ft at 2:30PM May 26, 2023Observed: 2271 ft at 2:45PM May 26, 2023Observed: 2270.99 ft at 3:00PM May 26, 2023Observed: 2271 ft at 3:15PM May 26, 2023Observed: 2271 ft at 3:30PM May 26, 2023Observed: 2271 ft at 3:45PM May 26, 2023Observed: 2271.01 ft at 4:00PM May 26, 2023Observed: 2271 ft at 4:15PM May 26, 2023Observed: 2271 ft at 4:30PM May 26, 2023Observed: 2271 ft at 4:45PM May 26, 2023Observed: 2271.01 ft at 5:00PM May 26, 2023Observed: 2271.01 ft at 5:15PM May 26, 2023Observed: 2271.01 ft at 5:30PM May 26, 2023Observed: 2271.01 ft at 5:45PM May 26, 2023Observed: 2271 ft at 6:00PM May 26, 2023Observed: 2271.01 ft at 6:15PM May 26, 2023Observed: 2271.01 ft at 6:30PM May 26, 2023Observed: 2271.01 ft at 6:45PM May 26, 2023Observed: 2271.01 ft at 7:00PM May 26, 2023Observed: 2271.01 ft at 7:15PM May 26, 2023Observed: 2271.01 ft at 7:30PM May 26, 2023Observed: 2271.01 ft at 7:45PM May 26, 2023Observed: 2271.01 ft at 8:00PM May 26, 2023Observed: 2271.01 ft at 8:15PM May 26, 2023Observed: 2271.01 ft at 8:30PM May 26, 2023Observed: 2271.01 ft at 8:45PM May 26, 2023Observed: 2271.01 ft at 9:00PM May 26, 2023Observed: 2271.02 ft at 9:15PM May 26, 2023Observed: 2271.02 ft at 9:30PM May 26, 2023Observed: 2271.01 ft at 9:45PM May 26, 2023Observed: 2271.01 ft at 10:00PM May 26, 2023Observed: 2271.01 ft at 10:15PM May 26, 2023Observed: 2271.01 ft at 10:30PM May 26, 2023Observed: 2271.01 ft at 10:45PM May 26, 2023Observed: 2271.01 ft at 11:00PM May 26, 2023Observed: 2271.01 ft at 11:15PM May 26, 2023Observed: 2271.01 ft at 11:30PM May 26, 2023Observed: 2271.01 ft at 11:45PM May 26, 2023Observed: 2271.01 ft at 12:00AM May 27, 2023Observed: 2271.01 ft at 12:15AM May 27, 2023Observed: 2271.02 ft at 12:30AM May 27, 2023Observed: 2271.02 ft at 12:45AM May 27, 2023Observed: 2271.01 ft at 1:00AM May 27, 2023Observed: 2271.02 ft at 1:15AM May 27, 2023Observed: 2271.01 ft at 1:30AM May 27, 2023Observed: 2271.01 ft at 1:45AM May 27, 2023Observed: 2271.02 ft at 2:00AM May 27, 2023Observed: 2271.02 ft at 2:15AM May 27, 2023Observed: 2271.02 ft at 2:30AM May 27, 2023Observed: 2271.01 ft at 2:45AM May 27, 2023Observed: 2271.02 ft at 3:00AM May 27, 2023Observed: 2271.02 ft at 3:15AM May 27, 2023Observed: 2271.01 ft at 3:30AM May 27, 2023Observed: 2271.02 ft at 3:45AM May 27, 2023Observed: 2271.01 ft at 4:00AM May 27, 2023Observed: 2271.02 ft at 4:15AM May 27, 2023Observed: 2271.02 ft at 4:30AM May 27, 2023Observed: 2271.02 ft at 4:45AM May 27, 2023Observed: 2271.02 ft at 5:00AM May 27, 2023Observed: 2271.02 ft at 5:15AM May 27, 2023Observed: 2271.02 ft at 5:30AM May 27, 2023Observed: 2271.02 ft at 5:45AM May 27, 2023Observed: 2271.02 ft at 6:00AM May 27, 2023Observed: 2271.01 ft at 6:15AM May 27, 2023Observed: 2271.02 ft at 6:30AM May 27, 2023Observed: 2271.02 ft at 6:45AM May 27, 2023Observed: 2271.02 ft at 7:00AM May 27, 2023Observed: 2271.02 ft at 7:15AM May 27, 2023Observed: 2271.02 ft at 7:30AM May 27, 2023Observed: 2271.02 ft at 7:45AM May 27, 2023Observed: 2271.02 ft at 8:00AM May 27, 2023Observed: 2271.02 ft at 8:15AM May 27, 2023Observed: 2271.02 ft at 8:30AM May 27, 2023Observed: 2271.02 ft at 8:45AM May 27, 2023Observed: 2271.02 ft at 9:00AM May 27, 2023Observed: 2271.02 ft at 9:15AM May 27, 2023Observed: 2271.02 ft at 9:30AM May 27, 2023Observed: 2271.02 ft at 9:45AM May 27, 2023Observed: 2271.02 ft at 10:00AM May 27, 2023Observed: 2271.03 ft at 10:15AM May 27, 2023Observed: 2271.02 ft at 10:30AM May 27, 2023Observed: 2271.02 ft at 10:45AM May 27, 2023Observed: 2271.03 ft at 11:00AM May 27, 2023Observed: 2271.02 ft at 11:15AM May 27, 2023Observed: 2271.02 ft at 11:30AM May 27, 2023Observed: 2271.02 ft at 11:45AM May 27, 2023Observed: 2271.02 ft at 12:00PM May 27, 2023Observed: 2271.03 ft at 12:15PM May 27, 2023Observed: 2271.02 ft at 12:30PM May 27, 2023Observed: 2271.02 ft at 12:45PM May 27, 2023Observed: 2271.02 ft at 1:00PM May 27, 2023Observed: 2271.02 ft at 1:15PM May 27, 2023Observed: 2271.03 ft at 1:30PM May 27, 2023Observed: 2271.03 ft at 1:45PM May 27, 2023Observed: 2271.03 ft at 2:00PM May 27, 2023Observed: 2271.03 ft at 2:15PM May 27, 2023Observed: 2271.03 ft at 2:30PM May 27, 2023Observed: 2271.03 ft at 2:45PM May 27, 2023Observed: 2271.04 ft at 3:00PM May 27, 2023Observed: 2271.03 ft at 3:15PM May 27, 2023Observed: 2271.03 ft at 3:30PM May 27, 2023Observed: 2271.03 ft at 3:45PM May 27, 2023Observed: 2271.04 ft at 4:00PM May 27, 2023Observed: 2271.03 ft at 4:15PM May 27, 2023Observed: 2271.04 ft at 4:30PM May 27, 2023Observed: 2271.04 ft at 4:45PM May 27, 2023Observed: 2271.04 ft at 5:00PM May 27, 2023Observed: 2271.03 ft at 5:15PM May 27, 2023Observed: 2271.04 ft at 5:30PM May 27, 2023Observed: 2271.04 ft at 5:45PM May 27, 2023Observed: 2271.04 ft at 6:00PM May 27, 2023Observed: 2271.04 ft at 6:15PM May 27, 2023Observed: 2271.04 ft at 6:30PM May 27, 2023Observed: 2271.04 ft at 6:45PM May 27, 2023Observed: 2271.04 ft at 7:00PM May 27, 2023Observed: 2271.05 ft at 7:15PM May 27, 2023Observed: 2271.04 ft at 7:30PM May 27, 2023Observed: 2271.04 ft at 7:45PM May 27, 2023Observed: 2271.04 ft at 8:00PM May 27, 2023Observed: 2271.04 ft at 8:15PM May 27, 2023Observed: 2271.04 ft at 8:30PM May 27, 2023Observed: 2271.04 ft at 8:45PM May 27, 2023Observed: 2271.04 ft at 9:00PM May 27, 2023Observed: 2271.04 ft at 9:15PM May 27, 2023Observed: 2271.04 ft at 9:30PM May 27, 2023Observed: 2271.04 ft at 9:45PM May 27, 2023Observed: 2271.04 ft at 10:00PM May 27, 2023Observed: 2271.04 ft at 10:15PM May 27, 2023Observed: 2271.04 ft at 10:30PM May 27, 2023Observed: 2271.04 ft at 10:45PM May 27, 2023Observed: 2271.04 ft at 11:00PM May 27, 2023Observed: 2271.04 ft at 11:15PM May 27, 2023Observed: 2271.04 ft at 11:30PM May 27, 2023Observed: 2271.04 ft at 11:45PM May 27, 2023Observed: 2271.03 ft at 12:00AM May 28, 2023Observed: 2271.04 ft at 12:15AM May 28, 2023Observed: 2271.04 ft at 12:30AM May 28, 2023Observed: 2271.04 ft at 12:45AM May 28, 2023Observed: 2271.04 ft at 1:00AM May 28, 2023Observed: 2271.04 ft at 1:15AM May 28, 2023Observed: 2271.04 ft at 1:30AM May 28, 2023Observed: 2271.05 ft at 1:45AM May 28, 2023Observed: 2271.04 ft at 2:00AM May 28, 2023Observed: 2271.04 ft at 2:15AM May 28, 2023Observed: 2271.04 ft at 2:30AM May 28, 2023Observed: 2271.04 ft at 2:45AM May 28, 2023Observed: 2271.04 ft at 3:00AM May 28, 2023Observed: 2271.05 ft at 3:15AM May 28, 2023Observed: 2271.04 ft at 3:30AM May 28, 2023Observed: 2271.04 ft at 3:45AM May 28, 2023Observed: 2271.05 ft at 4:00AM May 28, 2023Observed: 2271.04 ft at 4:15AM May 28, 2023Observed: 2271.05 ft at 4:30AM May 28, 2023Observed: 2271.05 ft at 4:45AM May 28, 2023Observed: 2271.04 ft at 5:00AM May 28, 2023Observed: 2271.05 ft at 5:15AM May 28, 2023Observed: 2271.05 ft at 5:30AM May 28, 2023Observed: 2271.04 ft at 5:45AM May 28, 2023Observed: 2271.05 ft at 6:00AM May 28, 2023Observed: 2271.04 ft at 6:15AM May 28, 2023Observed: 2271.05 ft at 6:30AM May 28, 2023Observed: 2271.05 ft at 6:45AM May 28, 2023Observed: 2271.05 ft at 7:00AM May 28, 2023Observed: 2271.04 ft at 7:15AM May 28, 2023Observed: 2271.05 ft at 7:30AM May 28, 2023Observed: 2271.05 ft at 7:45AM May 28, 2023Observed: 2271.05 ft at 8:00AM May 28, 2023Observed: 2271.05 ft at 8:15AM May 28, 2023Observed: 2271.04 ft at 8:30AM May 28, 2023Observed: 2271.05 ft at 8:45AM May 28, 2023Observed: 2271.04 ft at 9:00AM May 28, 2023Observed: 2271.05 ft at 9:15AM May 28, 2023Observed: 2271.05 ft at 9:30AM May 28, 2023Observed: 2271.05 ft at 9:45AM May 28, 2023Observed: 2271.05 ft at 10:00AM May 28, 2023Observed: 2271.05 ft at 10:15AM May 28, 2023Observed: 2271.05 ft at 10:30AM May 28, 2023Observed: 2271.05 ft at 10:45AM May 28, 2023Observed: 2271.05 ft at 11:00AM May 28, 2023Observed: 2271.05 ft at 11:15AM May 28, 2023Observed: 2271.06 ft at 11:30AM May 28, 2023Observed: 2271.05 ft at 11:45AM May 28, 2023Observed: 2271.05 ft at 12:00PM May 28, 2023Observed: 2271.05 ft at 12:15PM May 28, 2023Observed: 2271.06 ft at 12:30PM May 28, 2023Observed: 2271.06 ft at 12:45PM May 28, 2023Observed: 2271.06 ft at 1:00PM May 28, 2023Observed: 2271.05 ft at 1:15PM May 28, 2023Observed: 2271.06 ft at 1:30PM May 28, 2023Observed: 2271.06 ft at 1:45PM May 28, 2023Observed: 2271.06 ft at 2:00PM May 28, 2023Observed: 2271.05 ft at 2:15PM May 28, 2023Observed: 2271.05 ft at 2:30PM May 28, 2023Observed: 2271.06 ft at 2:45PM May 28, 2023Observed: 2271.06 ft at 3:00PM May 28, 2023Observed: 2271.06 ft at 3:15PM May 28, 2023Observed: 2271.05 ft at 3:30PM May 28, 2023Observed: 2271.06 ft at 3:45PM May 28, 2023Observed: 2271.06 ft at 4:00PM May 28, 2023Observed: 2271.06 ft at 4:15PM May 28, 2023Observed: 2271.07 ft at 4:30PM May 28, 2023Observed: 2271.06 ft at 4:45PM May 28, 2023Observed: 2271.06 ft at 5:00PM May 28, 2023Observed: 2271.06 ft at 5:15PM May 28, 2023Observed: 2271.07 ft at 5:30PM May 28, 2023Observed: 2271.07 ft at 5:45PM May 28, 2023Observed: 2271.06 ft at 6:00PM May 28, 2023Observed: 2271.06 ft at 6:15PM May 28, 2023Observed: 2271.07 ft at 6:30PM May 28, 2023Observed: 2271.07 ft at 6:45PM May 28, 2023Observed: 2271.06 ft at 7:00PM May 28, 2023Observed: 2271.06 ft at 7:15PM May 28, 2023Observed: 2271.07 ft at 7:30PM May 28, 2023Observed: 2271.06 ft at 7:45PM May 28, 2023Observed: 2271.07 ft at 8:00PM May 28, 2023Observed: 2271.07 ft at 8:15PM May 28, 2023Observed: 2271.07 ft at 9:30PM May 28, 2023Observed: 2271.07 ft at 9:45PM May 28, 2023Observed: 2271.06 ft at 10:00PM May 28, 2023Observed: 2271.07 ft at 10:15PM May 28, 2023Observed: 2271.07 ft at 10:30PM May 28, 2023Observed: 2271.07 ft at 10:45PM May 28, 2023Observed: 2271.07 ft at 11:00PM May 28, 2023Observed: 2271.07 ft at 11:15PM May 28, 2023Observed: 2271.07 ft at 11:30PM May 28, 2023Observed: 2271.07 ft at 11:45PM May 28, 2023Observed: 2271.07 ft at 12:00AM May 29, 2023Observed: 2271.07 ft at 12:15AM May 29, 2023Observed: 2271.07 ft at 12:30AM May 29, 2023Observed: 2271.07 ft at 12:45AM May 29, 2023Observed: 2271.07 ft at 1:00AM May 29, 2023Observed: 2271.07 ft at 1:15AM May 29, 2023Observed: 2271.07 ft at 1:30AM May 29, 2023Observed: 2271.07 ft at 1:45AM May 29, 2023Observed: 2271.07 ft at 2:00AM May 29, 2023Highest Observation: 2271.08 ft at 2:15AM May 29, 2023Observed: 2271.07 ft at 2:30AM May 29, 2023Observed: 2271.07 ft at 2:45AM May 29, 2023Observed: 2271.07 ft at 3:00AM May 29, 2023Observed: 2271.07 ft at 3:15AM May 29, 2023Observed: 2271.07 ft at 3:30AM May 29, 2023Observed: 2271.07 ft at 3:45AM May 29, 2023Highest Observation: 2271.08 ft at 4:00AM May 29, 2023Observed: 2271.07 ft at 4:15AM May 29, 2023Observed: 2271.07 ft at 4:30AM May 29, 2023Observed: 2271.07 ft at 4:45AM May 29, 2023Observed: 2271.07 ft at 5:00AM May 29, 2023Observed: 2271.07 ft at 5:15AM May 29, 2023Bureau of ReclamationSHAS2(plotting HPIRG) Graph Created (6:09AM May 29, 2023)ObservedLatest observed value: 2271.07 ft at 5:15 AM MDT 29-May-2023.
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About this graph
Tabular Data (UTC)
Tabular Data (MDT)
XML Data
RSS Files
Datum: NGVD29
Metadata
NOTE: River forecasts for this location take into account past and future precipitation. The stages/flows that will occur may be different if future rainfall is different than forecast.

NOTE: Forecasts are not available for the Grand River (SD) at Shadehill Reservoir. Only observed stages are available for this point.

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Upstream Locations Upstream Gauge Downstream Gauge Downstream Gauge - near Little Eagle
Flood Categories (in feet)
Major Flood Stage: 0
Moderate Flood Stage: 0
Flood Stage: 0
Action Stage: 2272
Low Stage (in feet): -9999

Historic Crests
(1) 2,297.86 ft on 04/10/1952
(2) 2,290.83 ft on 04/17/2009
(3) 2,283.98 ft on 03/29/2019
(4) 2,282.42 ft on 04/02/1978
(5) 2,280.01 ft on 03/24/1997
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 2,267.54 ft on 07/18/2022
(2) 2,269.26 ft on 10/01/2020
(3) 2,272.02 ft on 04/10/2020
(4) 2,283.98 ft on 03/29/2019
(5) 2,272.24 ft on 05/24/2018
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) 2,257.30 ft on 03/05/2008
Show More Low Water Records

For more information on your flood risk go to www.floodsmart.gov.
Zoom Level:10
KML Image
Gauge LocationGauge Map Marker
 Disclaimer
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
2318 Dam crest elevation.
2297.9 Near record flooding with similar flooding to what occurred in 1950 before the reservoir was completed.
2290.83 Reservoir elevation on April 17, 2009.
2280 Water begins to impact the road to the Shadehill Recreation Area.
2272 Water begins flowing into an uncontrolled outlet and is discharged downstream.
2260 Top of active conservation pool.
2253.4 Top of inactive conservation pool.
2250.8 Top of dead storage pool.
2220 Streambed elevation at dam axis.
Photos
(1) Shadehill Dam
(2) Looking downstream
(3) Shadehill Reservoir
(4) Spillway
About This Location Collapse

Latitude: 45.753333° N, Longitude: 102.203889° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame		 Gauge Height Flood Stage Uses
NWS stage 0 ft Not Available Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps
Vertical Datum Elevation
(gauge height = 0)		 Elevation
(gauge height = flood stage)		 Elevation information source
NAVD88 2200 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  

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
Rapid City Weather Forecast Office
300 East Signal Drive
Rapid City, SD 57701-3800
(605) 341-7531
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