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Weather Forecast Office Rapid City, SD

Missouri Basin River Forecast Center

Winter Weather Advisory

Hydrograph

River at a Glance

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About this graph Tabular Data (UTC) Tabular Data (MST) Datum: NAVD88 Metadata

NOTE: USGS operates this gage on a seasonal basis. No data are available during winter months. NOTE: Forecasts are not available for the Grizzly Bear Creek near Keystone. Only observed stages are available for this point.

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Flood Categories (in feet) Major Flood Stage: 6 Moderate Flood Stage: 5.5 Flood Stage: 4.5 Action Stage: 4 Low Stage (in feet): -9999 Historic Crests (1) 6.32 ft on 10/11/2013 (2) 5.78 ft on 05/20/2016 (3) 5.71 ft on 05/28/2019 (4) 5.68 ft on 05/24/2015 (5) 5.60 ft on 07/11/2001 Show More Historic Crests (P): Preliminary values subject to further review. Recent Crests (1) 3.53 ft on 05/23/2021 (2) 3.13 ft on 07/05/2020 (3) 5.71 ft on 05/28/2019 (4) 5.42 ft on 07/18/2018 (5) 3.69 ft on 06/05/2017 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 www.floodsmart.gov. Show FEMA's National Flood Hazard Layers FEMA's National Flood Hazard Layers not showing? Why aren't the FEMA National Flood Hazard Layers showing on the ESRI Map? Possible reasons: There are no FEMA National Flood Hazard Layers for the location which you are viewing on ESRI Maps. The FEMA Web Mapping Service (WMS) is down. Note: Your zoom level may have changed. ESRI's zoom levels must be between 14 and 16 to show National Flood Hazard layers.

Zoom Level:14 Legend FEMA Layer Gauge Location 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

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6	Major Flood Stage. Water will begin to flow down Main Street in Keystone.
5.5	Moderate Flood Stage. Water will begin to cover bridges and parking areas in Keystone.
5	Minor flooding along the creek and downstream. Water begins to fill Grizzly Bear Creek in Keystone.
4.5	Minor flood stage. The creek will overflow and cut off access to Grizzly Gulch Road. Overflows the lower banks downstream from gage.
4	Action Stage and bankfull.
Photos (1) Looking downstream (2) Looking upstream (3) Gage site

About This Location

Latitude: 43.878043° N, Longitude: 103.437691° W, Horizontal Datum: NAD83/WGS84 River Stage Reference Frame Gauge Height Flood Stage Uses NWS stage 0 ft 4.5 ft 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 4512 4516.5 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: U.S. Geological Survey (USGS) Data and Site Info for Keystone

Resources

Hydrologic Resources Text Products Past Precipitation Forecast Precipitation River Forecast Centers River Stage Summary Missouri Basin River Forecast Center NOHRSC - Snow Survey Drought Monitor MADIS-HADS River Stage Data Turn Around Don't Drown Inundation Mapping Locations

Additional Resources Area Hydrographs NWS Precipitation and River Forecasting AHPS Iframes for Developers Mobile iNWS for emergency management Flood Event Archive Spring Flood Outlook

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