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Hydrograph River at a Glance Download
Grand River (SD) at Shadehill Reservoir Pool (ft)Highest Observation: 2266.29 ft at 1:00AM Feb 22, 2021Highest Observation: 2266.29 ft at 1:15AM Feb 22, 2021Highest Observation: 2266.29 ft at 1:30AM Feb 22, 2021Highest Observation: 2266.29 ft at 1:45AM Feb 22, 2021Highest Observation: 2266.29 ft at 2:00AM Feb 22, 2021Highest Observation: 2266.29 ft at 2:15AM Feb 22, 2021Highest Observation: 2266.29 ft at 2:30AM Feb 22, 2021Observed: 2266.28 ft at 2:45AM Feb 22, 2021Highest Observation: 2266.29 ft at 3:00AM Feb 22, 2021Observed: 2266.28 ft at 3:15AM Feb 22, 2021Observed: 2266.28 ft at 3:30AM Feb 22, 2021Observed: 2266.28 ft at 3:45AM Feb 22, 2021Highest Observation: 2266.29 ft at 4:00AM Feb 22, 2021Highest Observation: 2266.29 ft at 4:15AM Feb 22, 2021Observed: 2266.28 ft at 4:30AM Feb 22, 2021Highest Observation: 2266.29 ft at 4:45AM Feb 22, 2021Observed: 2266.28 ft at 5:00AM Feb 22, 2021Observed: 2266.28 ft at 5:15AM Feb 22, 2021Observed: 2266.28 ft at 5:30AM Feb 22, 2021Highest Observation: 2266.29 ft at 5:45AM Feb 22, 2021Observed: 2266.28 ft at 6:00AM Feb 22, 2021Highest Observation: 2266.29 ft at 6:15AM Feb 22, 2021Observed: 2266.28 ft at 6:30AM Feb 22, 2021Observed: 2266.28 ft at 6:45AM Feb 22, 2021Highest Observation: 2266.29 ft at 7:00AM Feb 22, 2021Observed: 2266.28 ft at 7:15AM Feb 22, 2021Observed: 2266.28 ft at 7:30AM Feb 22, 2021Observed: 2266.28 ft at 7:45AM Feb 22, 2021Observed: 2266.28 ft at 8:00AM Feb 22, 2021Observed: 2266.27 ft at 8:15AM Feb 22, 2021Observed: 2266.27 ft at 8:30AM Feb 22, 2021Observed: 2266.28 ft at 8:45AM Feb 22, 2021Observed: 2266.28 ft at 9:00AM Feb 22, 2021Observed: 2266.28 ft at 9:15AM Feb 22, 2021Observed: 2266.28 ft at 9:30AM Feb 22, 2021Observed: 2266.28 ft at 9:45AM Feb 22, 2021Observed: 2266.27 ft at 10:00AM Feb 22, 2021Observed: 2266.27 ft at 10:15AM Feb 22, 2021Observed: 2266.27 ft at 10:30AM Feb 22, 2021Observed: 2266.27 ft at 10:45AM Feb 22, 2021Observed: 2266.28 ft at 11:00AM Feb 22, 2021Observed: 2266.27 ft at 11:15AM Feb 22, 2021Observed: 2266.28 ft at 11:30AM Feb 22, 2021Observed: 2266.27 ft at 11:45AM Feb 22, 2021Observed: 2266.27 ft at 12:00PM Feb 22, 2021Observed: 2266.27 ft at 12:15PM Feb 22, 2021Observed: 2266.27 ft at 12:30PM Feb 22, 2021Observed: 2266.27 ft at 12:45PM Feb 22, 2021Observed: 2266.27 ft at 1:00PM Feb 22, 2021Observed: 2266.27 ft at 1:15PM Feb 22, 2021Observed: 2266.27 ft at 1:30PM Feb 22, 2021Observed: 2266.27 ft at 1:45PM Feb 22, 2021Observed: 2266.26 ft at 2:00PM Feb 22, 2021Observed: 2266.26 ft at 2:15PM Feb 22, 2021Observed: 2266.26 ft at 2:30PM Feb 22, 2021Observed: 2266.26 ft at 2:45PM Feb 22, 2021Observed: 2266.26 ft at 3:00PM Feb 22, 2021Observed: 2266.27 ft at 3:15PM Feb 22, 2021Observed: 2266.27 ft at 3:30PM Feb 22, 2021Observed: 2266.27 ft at 3:45PM Feb 22, 2021Observed: 2266.26 ft at 4:00PM Feb 22, 2021Observed: 2266.26 ft at 4:15PM Feb 22, 2021Observed: 2266.26 ft at 4:30PM Feb 22, 2021Observed: 2266.26 ft at 4:45PM Feb 22, 2021Observed: 2266.26 ft at 5:00PM Feb 22, 2021Observed: 2266.25 ft at 5:15PM Feb 22, 2021Observed: 2266.25 ft at 5:30PM Feb 22, 2021Observed: 2266.25 ft at 5:45PM Feb 22, 2021Observed: 2266.26 ft at 6:00PM Feb 22, 2021Observed: 2266.25 ft at 6:15PM Feb 22, 2021Observed: 2266.25 ft at 6:30PM Feb 22, 2021Observed: 2266.25 ft at 6:45PM Feb 22, 2021Observed: 2266.26 ft at 7:00PM Feb 22, 2021Observed: 2266.25 ft at 7:15PM Feb 22, 2021Observed: 2266.25 ft at 7:30PM Feb 22, 2021Observed: 2266.25 ft at 7:45PM Feb 22, 2021Observed: 2266.25 ft at 8:00PM Feb 22, 2021Observed: 2266.26 ft at 8:15PM Feb 22, 2021Observed: 2266.25 ft at 8:30PM Feb 22, 2021Observed: 2266.25 ft at 8:45PM Feb 22, 2021Observed: 2266.25 ft at 9:00PM Feb 22, 2021Observed: 2266.26 ft at 9:15PM Feb 22, 2021Observed: 2266.26 ft at 9:30PM Feb 22, 2021Observed: 2266.26 ft at 9:45PM Feb 22, 2021Observed: 2266.25 ft at 10:00PM Feb 22, 2021Observed: 2266.25 ft at 10:15PM Feb 22, 2021Observed: 2266.25 ft at 10:30PM Feb 22, 2021Observed: 2266.25 ft at 10:45PM Feb 22, 2021Observed: 2266.25 ft at 11:00PM Feb 22, 2021Observed: 2266.26 ft at 11:15PM Feb 22, 2021Observed: 2266.25 ft at 11:30PM Feb 22, 2021Observed: 2266.25 ft at 11:45PM Feb 22, 2021Observed: 2266.25 ft at 12:00AM Feb 23, 2021Observed: 2266.25 ft at 12:15AM Feb 23, 2021Observed: 2266.25 ft at 12:30AM Feb 23, 2021Observed: 2266.25 ft at 12:45AM Feb 23, 2021Observed: 2266.25 ft at 1:00AM Feb 23, 2021Observed: 2266.25 ft at 1:15AM Feb 23, 2021Observed: 2266.25 ft at 1:30AM Feb 23, 2021Observed: 2266.25 ft at 1:45AM Feb 23, 2021Observed: 2266.25 ft at 2:00AM Feb 23, 2021Observed: 2266.25 ft at 2:15AM Feb 23, 2021Observed: 2266.25 ft at 2:30AM Feb 23, 2021Observed: 2266.26 ft at 2:45AM Feb 23, 2021Observed: 2266.25 ft at 3:00AM Feb 23, 2021Observed: 2266.25 ft at 3:15AM Feb 23, 2021Observed: 2266.25 ft at 3:30AM Feb 23, 2021Observed: 2266.25 ft at 3:45AM Feb 23, 2021Observed: 2266.25 ft at 4:00AM Feb 23, 2021Observed: 2266.25 ft at 4:15AM Feb 23, 2021Observed: 2266.25 ft at 4:30AM Feb 23, 2021Observed: 2266.25 ft at 4:45AM Feb 23, 2021Observed: 2266.25 ft at 5:00AM Feb 23, 2021Observed: 2266.25 ft at 5:15AM Feb 23, 2021Observed: 2266.25 ft at 5:30AM Feb 23, 2021Observed: 2266.25 ft at 5:45AM Feb 23, 2021Observed: 2266.25 ft at 6:00AM Feb 23, 2021Observed: 2266.26 ft at 6:15AM Feb 23, 2021Observed: 2266.26 ft at 6:30AM Feb 23, 2021Observed: 2266.25 ft at 6:45AM Feb 23, 2021Observed: 2266.26 ft at 7:00AM Feb 23, 2021Observed: 2266.26 ft at 7:15AM Feb 23, 2021Observed: 2266.25 ft at 7:30AM Feb 23, 2021Observed: 2266.25 ft at 7:45AM Feb 23, 2021Observed: 2266.25 ft at 8:00AM Feb 23, 2021Observed: 2266.25 ft at 8:15AM Feb 23, 2021Observed: 2266.25 ft at 8:30AM Feb 23, 2021Observed: 2266.25 ft at 8:45AM Feb 23, 2021Observed: 2266.25 ft at 9:00AM Feb 23, 2021Observed: 2266.25 ft at 9:15AM Feb 23, 2021Observed: 2266.25 ft at 9:30AM Feb 23, 2021Observed: 2266.24 ft at 9:45AM Feb 23, 2021Observed: 2266.25 ft at 10:00AM Feb 23, 2021Observed: 2266.25 ft at 10:15AM Feb 23, 2021Observed: 2266.25 ft at 10:30AM Feb 23, 2021Observed: 2266.25 ft at 10:45AM Feb 23, 2021Observed: 2266.25 ft at 11:00AM Feb 23, 2021Observed: 2266.24 ft at 11:15AM Feb 23, 2021Observed: 2266.25 ft at 11:30AM Feb 23, 2021Observed: 2266.24 ft at 11:45AM Feb 23, 2021Observed: 2266.25 ft at 12:00PM Feb 23, 2021Observed: 2266.25 ft at 12:15PM Feb 23, 2021Observed: 2266.25 ft at 12:30PM Feb 23, 2021Observed: 2266.25 ft at 12:45PM Feb 23, 2021Observed: 2266.24 ft at 1:00PM Feb 23, 2021Observed: 2266.25 ft at 1:15PM Feb 23, 2021Observed: 2266.24 ft at 1:30PM Feb 23, 2021Observed: 2266.24 ft at 1:45PM Feb 23, 2021Observed: 2266.25 ft at 2:00PM Feb 23, 2021Observed: 2266.24 ft at 2:15PM Feb 23, 2021Observed: 2266.24 ft at 2:30PM Feb 23, 2021Observed: 2266.24 ft at 2:45PM Feb 23, 2021Observed: 2266.25 ft at 3:00PM Feb 23, 2021Observed: 2266.24 ft at 3:15PM Feb 23, 2021Observed: 2266.25 ft at 3:30PM Feb 23, 2021Observed: 2266.24 ft at 3:45PM Feb 23, 2021Observed: 2266.24 ft at 4:00PM Feb 23, 2021Observed: 2266.24 ft at 4:15PM Feb 23, 2021Observed: 2266.25 ft at 4:30PM Feb 23, 2021Observed: 2266.24 ft at 4:45PM Feb 23, 2021Observed: 2266.23 ft at 5:00PM Feb 23, 2021Observed: 2266.24 ft at 5:15PM Feb 23, 2021Observed: 2266.24 ft at 5:30PM Feb 23, 2021Observed: 2266.24 ft at 5:45PM Feb 23, 2021Observed: 2266.23 ft at 6:00PM Feb 23, 2021Observed: 2266.23 ft at 6:15PM Feb 23, 2021Observed: 2266.23 ft at 6:30PM Feb 23, 2021Observed: 2266.24 ft at 6:45PM Feb 23, 2021Observed: 2266.23 ft at 7:00PM Feb 23, 2021Observed: 2266.23 ft at 7:15PM Feb 23, 2021Observed: 2266.23 ft at 7:30PM Feb 23, 2021Observed: 2266.23 ft at 7:45PM Feb 23, 2021Observed: 2266.23 ft at 8:00PM Feb 23, 2021Observed: 2266.23 ft at 8:15PM Feb 23, 2021Observed: 2266.23 ft at 8:30PM Feb 23, 2021Observed: 2266.23 ft at 8:45PM Feb 23, 2021Observed: 2266.22 ft at 9:00PM Feb 23, 2021Observed: 2266.23 ft at 9:15PM Feb 23, 2021Observed: 2266.22 ft at 9:30PM Feb 23, 2021Observed: 2266.23 ft at 9:45PM Feb 23, 2021Observed: 2266.22 ft at 10:00PM Feb 23, 2021Observed: 2266.22 ft at 10:15PM Feb 23, 2021Observed: 2266.22 ft at 10:30PM Feb 23, 2021Observed: 2266.22 ft at 10:45PM Feb 23, 2021Observed: 2266.23 ft at 11:00PM Feb 23, 2021Observed: 2266.22 ft at 11:15PM Feb 23, 2021Observed: 2266.22 ft at 11:30PM Feb 23, 2021Observed: 2266.22 ft at 11:45PM Feb 23, 2021Observed: 2266.22 ft at 12:00AM Feb 24, 2021Observed: 2266.22 ft at 12:15AM Feb 24, 2021Observed: 2266.22 ft at 12:30AM Feb 24, 2021Observed: 2266.22 ft at 12:45AM Feb 24, 2021Observed: 2266.22 ft at 1:00AM Feb 24, 2021Observed: 2266.22 ft at 1:15AM Feb 24, 2021Observed: 2266.21 ft at 1:30AM Feb 24, 2021Observed: 2266.22 ft at 1:45AM Feb 24, 2021Observed: 2266.22 ft at 2:00AM Feb 24, 2021Observed: 2266.22 ft at 2:15AM Feb 24, 2021Observed: 2266.22 ft at 2:30AM Feb 24, 2021Observed: 2266.22 ft at 2:45AM Feb 24, 2021Observed: 2266.22 ft at 3:00AM Feb 24, 2021Observed: 2266.22 ft at 3:15AM Feb 24, 2021Observed: 2266.22 ft at 3:30AM Feb 24, 2021Observed: 2266.22 ft at 3:45AM Feb 24, 2021Observed: 2266.21 ft at 4:00AM Feb 24, 2021Observed: 2266.22 ft at 4:15AM Feb 24, 2021Observed: 2266.22 ft at 4:30AM Feb 24, 2021Observed: 2266.22 ft at 4:45AM Feb 24, 2021Observed: 2266.21 ft at 5:00AM Feb 24, 2021Observed: 2266.22 ft at 5:15AM Feb 24, 2021Observed: 2266.21 ft at 5:30AM Feb 24, 2021Observed: 2266.22 ft at 5:45AM Feb 24, 2021Observed: 2266.21 ft at 6:00AM Feb 24, 2021Observed: 2266.21 ft at 6:15AM Feb 24, 2021Observed: 2266.21 ft at 6:30AM Feb 24, 2021Observed: 2266.22 ft at 6:45AM Feb 24, 2021Observed: 2266.22 ft at 7:00AM Feb 24, 2021Observed: 2266.22 ft at 7:15AM Feb 24, 2021Observed: 2266.21 ft at 7:30AM Feb 24, 2021Observed: 2266.21 ft at 7:45AM Feb 24, 2021Observed: 2266.21 ft at 8:00AM Feb 24, 2021Observed: 2266.22 ft at 8:15AM Feb 24, 2021Observed: 2266.21 ft at 8:30AM Feb 24, 2021Observed: 2266.21 ft at 8:45AM Feb 24, 2021Observed: 2266.21 ft at 9:00AM Feb 24, 2021Observed: 2266.21 ft at 9:15AM Feb 24, 2021Observed: 2266.21 ft at 9:30AM Feb 24, 2021Observed: 2266.21 ft at 9:45AM Feb 24, 2021Observed: 2266.21 ft at 10:00AM Feb 24, 2021Observed: 2266.21 ft at 10:15AM Feb 24, 2021Observed: 2266.21 ft at 10:30AM Feb 24, 2021Observed: 2266.21 ft at 10:45AM Feb 24, 2021Observed: 2266.21 ft at 11:00AM Feb 24, 2021Observed: 2266.21 ft at 11:15AM Feb 24, 2021Observed: 2266.21 ft at 11:30AM Feb 24, 2021Observed: 2266.2 ft at 11:45AM Feb 24, 2021Observed: 2266.2 ft at 12:00PM Feb 24, 2021Observed: 2266.21 ft at 12:15PM Feb 24, 2021Observed: 2266.21 ft at 12:30PM Feb 24, 2021Observed: 2266.21 ft at 12:45PM Feb 24, 2021Observed: 2266.21 ft at 1:00PM Feb 24, 2021Observed: 2266.2 ft at 1:15PM Feb 24, 2021Observed: 2266.21 ft at 1:30PM Feb 24, 2021Observed: 2266.2 ft at 1:45PM Feb 24, 2021Observed: 2266.2 ft at 2:00PM Feb 24, 2021Observed: 2266.2 ft at 2:15PM Feb 24, 2021Observed: 2266.2 ft at 2:30PM Feb 24, 2021Observed: 2266.21 ft at 2:45PM Feb 24, 2021Observed: 2266.21 ft at 3:00PM Feb 24, 2021Observed: 2266.21 ft at 3:15PM Feb 24, 2021Observed: 2266.2 ft at 4:30PM Feb 24, 2021Observed: 2266.2 ft at 4:45PM Feb 24, 2021Observed: 2266.2 ft at 5:00PM Feb 24, 2021Observed: 2266.21 ft at 5:15PM Feb 24, 2021Observed: 2266.2 ft at 5:30PM Feb 24, 2021Observed: 2266.2 ft at 5:45PM Feb 24, 2021Observed: 2266.2 ft at 6:00PM Feb 24, 2021Observed: 2266.2 ft at 6:15PM Feb 24, 2021Observed: 2266.2 ft at 6:30PM Feb 24, 2021Observed: 2266.2 ft at 6:45PM Feb 24, 2021Observed: 2266.2 ft at 7:00PM Feb 24, 2021Observed: 2266.2 ft at 7:15PM Feb 24, 2021Observed: 2266.2 ft at 7:30PM Feb 24, 2021Observed: 2266.19 ft at 7:45PM Feb 24, 2021Observed: 2266.19 ft at 8:00PM Feb 24, 2021Observed: 2266.19 ft at 8:15PM Feb 24, 2021Observed: 2266.2 ft at 8:30PM Feb 24, 2021Observed: 2266.2 ft at 8:45PM Feb 24, 2021Observed: 2266.19 ft at 9:00PM Feb 24, 2021Observed: 2266.2 ft at 9:15PM Feb 24, 2021Observed: 2266.19 ft at 9:30PM Feb 24, 2021Observed: 2266.2 ft at 9:45PM Feb 24, 2021Observed: 2266.2 ft at 10:00PM Feb 24, 2021Observed: 2266.2 ft at 10:15PM Feb 24, 2021Observed: 2266.19 ft at 10:30PM Feb 24, 2021Observed: 2266.2 ft at 10:45PM Feb 24, 2021Observed: 2266.2 ft at 11:00PM Feb 24, 2021Observed: 2266.2 ft at 11:15PM Feb 24, 2021Observed: 2266.2 ft at 11:30PM Feb 24, 2021Observed: 2266.19 ft at 11:45PM Feb 24, 2021Observed: 2266.19 ft at 12:00AM Feb 25, 2021Observed: 2266.2 ft at 12:15AM Feb 25, 2021Bureau of ReclamationSHAS2(plotting HPIRG) Graph Created (12:53AM Feb 25, 2021)ObservedLatest observed value: 2266.2 ft at 12:15 AM MST 25-Feb-2021.
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About this graph
Tabular Data (UTC)
Tabular Data (MST)
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: Gauge reading may be affected by ice.

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) 2,283.98 ft on 03/29/2019
(2) 2,272.24 ft on 05/24/2018
(3) 2,266.31 ft on 05/01/2017
(4) 2,270.40 ft on 10/01/2015
(5) 2,271.91 ft on 10/05/2014
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.

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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: NAD27

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 NULL 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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Page last modified: 2-Nov-2020 7:28 PM
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