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Hydrograph River at a Glance Download
Grizzly Bear Creek near Keystone Stage (ft)Flow (kcfs)Observed: 3.87 ft at 7:30PM Apr 07, 2021Observed: 3.87 ft at 7:45PM Apr 07, 2021Observed: 3.86 ft at 8:00PM Apr 07, 2021Observed: 3.86 ft at 8:15PM Apr 07, 2021Observed: 3.87 ft at 8:30PM Apr 07, 2021Observed: 3.86 ft at 8:45PM Apr 07, 2021Observed: 3.86 ft at 9:00PM Apr 07, 2021Observed: 3.86 ft at 9:15PM Apr 07, 2021Observed: 3.85 ft at 9:30PM Apr 07, 2021Observed: 3.86 ft at 9:45PM Apr 07, 2021Observed: 3.85 ft at 10:00PM Apr 07, 2021Observed: 3.85 ft at 10:15PM Apr 07, 2021Observed: 3.85 ft at 10:30PM Apr 07, 2021Observed: 3.85 ft at 10:45PM Apr 07, 2021Observed: 3.84 ft at 11:00PM Apr 07, 2021Observed: 3.85 ft at 11:15PM Apr 07, 2021Observed: 3.84 ft at 11:30PM Apr 07, 2021Observed: 3.85 ft at 11:45PM Apr 07, 2021Observed: 3.84 ft at 12:00AM Apr 08, 2021Observed: 3.85 ft at 12:15AM Apr 08, 2021Observed: 3.85 ft at 12:30AM Apr 08, 2021Observed: 3.85 ft at 12:45AM Apr 08, 2021Observed: 3.84 ft at 1:00AM Apr 08, 2021Observed: 3.83 ft at 1:15AM Apr 08, 2021Observed: 3.83 ft at 1:30AM Apr 08, 2021Observed: 3.83 ft at 1:45AM Apr 08, 2021Observed: 3.83 ft at 2:00AM Apr 08, 2021Observed: 3.83 ft at 2:15AM Apr 08, 2021Observed: 3.83 ft at 2:30AM Apr 08, 2021Observed: 3.83 ft at 2:45AM Apr 08, 2021Observed: 3.83 ft at 3:00AM Apr 08, 2021Observed: 3.82 ft at 3:15AM Apr 08, 2021Observed: 3.82 ft at 3:30AM Apr 08, 2021Observed: 3.82 ft at 3:45AM Apr 08, 2021Observed: 3.82 ft at 4:00AM Apr 08, 2021Observed: 3.82 ft at 4:15AM Apr 08, 2021Observed: 3.82 ft at 4:30AM Apr 08, 2021Observed: 3.82 ft at 4:45AM Apr 08, 2021Observed: 3.81 ft at 5:00AM Apr 08, 2021Observed: 3.81 ft at 5:15AM Apr 08, 2021Observed: 3.8 ft at 5:30AM Apr 08, 2021Observed: 3.8 ft at 5:45AM Apr 08, 2021Observed: 3.8 ft at 6:00AM Apr 08, 2021Observed: 3.79 ft at 6:15AM Apr 08, 2021Observed: 3.8 ft at 6:30AM Apr 08, 2021Observed: 3.79 ft at 6:45AM Apr 08, 2021Observed: 3.79 ft at 7:00AM Apr 08, 2021Observed: 3.78 ft at 7:15AM Apr 08, 2021Observed: 3.76 ft at 7:30AM Apr 08, 2021Observed: 3.76 ft at 7:45AM Apr 08, 2021Observed: 3.76 ft at 8:00AM Apr 08, 2021Observed: 3.75 ft at 8:15AM Apr 08, 2021Observed: 3.76 ft at 8:30AM Apr 08, 2021Observed: 3.75 ft at 8:45AM Apr 08, 2021Observed: 3.75 ft at 9:00AM Apr 08, 2021Observed: 3.74 ft at 9:15AM Apr 08, 2021Observed: 3.75 ft at 9:30AM Apr 08, 2021Observed: 3.75 ft at 9:45AM Apr 08, 2021Observed: 3.76 ft at 10:00AM Apr 08, 2021Observed: 3.76 ft at 10:15AM Apr 08, 2021Observed: 3.77 ft at 10:30AM Apr 08, 2021Observed: 3.78 ft at 10:45AM Apr 08, 2021Observed: 3.81 ft at 11:00AM Apr 08, 2021Observed: 3.81 ft at 11:15AM Apr 08, 2021Observed: 3.79 ft at 11:30AM Apr 08, 2021Observed: 3.79 ft at 11:45AM Apr 08, 2021Observed: 3.78 ft at 12:00PM Apr 08, 2021Observed: 3.79 ft at 12:15PM Apr 08, 2021Observed: 3.81 ft at 12:30PM Apr 08, 2021Observed: 3.81 ft at 12:45PM Apr 08, 2021Observed: 3.81 ft at 1:00PM Apr 08, 2021Observed: 3.81 ft at 1:15PM Apr 08, 2021Observed: 3.81 ft at 1:30PM Apr 08, 2021Observed: 3.81 ft at 1:45PM Apr 08, 2021Observed: 3.82 ft at 2:00PM Apr 08, 2021Observed: 3.82 ft at 2:15PM Apr 08, 2021Observed: 3.83 ft at 2:30PM Apr 08, 2021Observed: 3.86 ft at 2:45PM Apr 08, 2021Observed: 3.86 ft at 3:00PM Apr 08, 2021Observed: 3.86 ft at 3:15PM Apr 08, 2021Observed: 3.87 ft at 3:30PM Apr 08, 2021Observed: 3.86 ft at 3:45PM Apr 08, 2021Observed: 3.86 ft at 4:00PM Apr 08, 2021Observed: 3.87 ft at 4:15PM Apr 08, 2021Observed: 3.87 ft at 4:30PM Apr 08, 2021Observed: 3.88 ft at 4:45PM Apr 08, 2021Observed: 3.88 ft at 5:00PM Apr 08, 2021Observed: 3.89 ft at 5:15PM Apr 08, 2021Observed: 3.91 ft at 5:30PM Apr 08, 2021Observed: 3.91 ft at 5:45PM Apr 08, 2021Observed: 3.92 ft at 6:00PM Apr 08, 2021Observed: 3.92 ft at 6:15PM Apr 08, 2021Observed: 3.93 ft at 6:30PM Apr 08, 2021Observed: 3.94 ft at 6:45PM Apr 08, 2021Observed: 3.94 ft at 7:00PM Apr 08, 2021Observed: 3.94 ft at 7:15PM Apr 08, 2021Observed: 3.94 ft at 7:30PM Apr 08, 2021Highest Observation: 3.95 ft at 7:45PM Apr 08, 2021Highest Observation: 3.95 ft at 8:00PM Apr 08, 2021Observed: 3.94 ft at 8:15PM Apr 08, 2021Observed: 3.94 ft at 8:30PM Apr 08, 2021Highest Observation: 3.95 ft at 8:45PM Apr 08, 2021Observed: 3.94 ft at 9:00PM Apr 08, 2021Observed: 3.94 ft at 9:15PM Apr 08, 2021Highest Observation: 3.95 ft at 9:30PM Apr 08, 2021Observed: 3.94 ft at 9:45PM Apr 08, 2021Observed: 3.94 ft at 10:00PM Apr 08, 2021Observed: 3.94 ft at 10:15PM Apr 08, 2021Observed: 3.94 ft at 10:30PM Apr 08, 2021Observed: 3.93 ft at 10:45PM Apr 08, 2021Observed: 3.93 ft at 11:00PM Apr 08, 2021Observed: 3.93 ft at 11:15PM Apr 08, 2021Observed: 3.93 ft at 11:30PM Apr 08, 2021Observed: 3.93 ft at 11:45PM Apr 08, 2021Observed: 3.93 ft at 12:00AM Apr 09, 2021Observed: 3.93 ft at 12:15AM Apr 09, 2021Observed: 3.93 ft at 12:30AM Apr 09, 2021Observed: 3.93 ft at 12:45AM Apr 09, 2021Observed: 3.93 ft at 1:00AM Apr 09, 2021Observed: 3.92 ft at 1:15AM Apr 09, 2021Observed: 3.93 ft at 1:30AM Apr 09, 2021Observed: 3.92 ft at 1:45AM Apr 09, 2021Observed: 3.92 ft at 2:00AM Apr 09, 2021Observed: 3.92 ft at 2:15AM Apr 09, 2021Observed: 3.92 ft at 2:30AM Apr 09, 2021Observed: 3.92 ft at 2:45AM Apr 09, 2021Observed: 3.91 ft at 3:00AM Apr 09, 2021Observed: 3.92 ft at 3:15AM Apr 09, 2021Observed: 3.92 ft at 3:30AM Apr 09, 2021Observed: 3.91 ft at 3:45AM Apr 09, 2021Observed: 3.92 ft at 4:00AM Apr 09, 2021Observed: 3.91 ft at 4:15AM Apr 09, 2021Observed: 3.91 ft at 4:30AM Apr 09, 2021Observed: 3.9 ft at 4:45AM Apr 09, 2021Observed: 3.9 ft at 5:00AM Apr 09, 2021Observed: 3.9 ft at 5:15AM Apr 09, 2021Observed: 3.89 ft at 5:30AM Apr 09, 2021Observed: 3.9 ft at 5:45AM Apr 09, 2021Observed: 3.9 ft at 6:00AM Apr 09, 2021Observed: 3.89 ft at 6:15AM Apr 09, 2021Observed: 3.89 ft at 6:30AM Apr 09, 2021Observed: 3.9 ft at 6:45AM Apr 09, 2021Observed: 3.89 ft at 7:00AM Apr 09, 2021Observed: 3.89 ft at 7:15AM Apr 09, 2021Observed: 3.88 ft at 7:30AM Apr 09, 2021Observed: 3.88 ft at 7:45AM Apr 09, 2021Observed: 3.88 ft at 8:00AM Apr 09, 2021Observed: 3.87 ft at 8:15AM Apr 09, 2021Observed: 3.87 ft at 8:30AM Apr 09, 2021Observed: 3.87 ft at 8:45AM Apr 09, 2021Observed: 3.88 ft at 9:00AM Apr 09, 2021Observed: 3.86 ft at 9:15AM Apr 09, 2021Observed: 3.87 ft at 9:30AM Apr 09, 2021Observed: 3.87 ft at 9:45AM Apr 09, 2021Observed: 3.86 ft at 10:00AM Apr 09, 2021Observed: 3.86 ft at 10:15AM Apr 09, 2021Observed: 3.85 ft at 10:30AM Apr 09, 2021Observed: 3.85 ft at 10:45AM Apr 09, 2021Observed: 3.85 ft at 11:00AM Apr 09, 2021Observed: 3.85 ft at 11:15AM Apr 09, 2021Observed: 3.85 ft at 11:30AM Apr 09, 2021Observed: 3.85 ft at 11:45AM Apr 09, 2021Observed: 3.84 ft at 12:00PM Apr 09, 2021Observed: 3.85 ft at 12:15PM Apr 09, 2021Observed: 3.84 ft at 12:30PM Apr 09, 2021Observed: 3.84 ft at 12:45PM Apr 09, 2021Observed: 3.85 ft at 1:00PM Apr 09, 2021Observed: 3.84 ft at 1:15PM Apr 09, 2021Observed: 3.85 ft at 1:30PM Apr 09, 2021Observed: 3.84 ft at 1:45PM Apr 09, 2021Observed: 3.84 ft at 2:00PM Apr 09, 2021Observed: 3.83 ft at 2:15PM Apr 09, 2021Observed: 3.83 ft at 2:30PM Apr 09, 2021Observed: 3.83 ft at 2:45PM Apr 09, 2021Observed: 3.83 ft at 3:00PM Apr 09, 2021Observed: 3.84 ft at 3:15PM Apr 09, 2021Observed: 3.83 ft at 3:30PM Apr 09, 2021Observed: 3.84 ft at 3:45PM Apr 09, 2021Observed: 3.84 ft at 4:00PM Apr 09, 2021Observed: 3.84 ft at 4:15PM Apr 09, 2021Observed: 3.85 ft at 4:30PM Apr 09, 2021Observed: 3.85 ft at 4:45PM Apr 09, 2021Observed: 3.85 ft at 5:00PM Apr 09, 2021Observed: 3.86 ft at 5:15PM Apr 09, 2021Observed: 3.86 ft at 5:30PM Apr 09, 2021Observed: 3.86 ft at 5:45PM Apr 09, 2021Observed: 3.87 ft at 6:00PM Apr 09, 2021Observed: 3.87 ft at 6:15PM Apr 09, 2021Observed: 3.87 ft at 6:30PM Apr 09, 2021Observed: 3.87 ft at 6:45PM Apr 09, 2021Observed: 3.86 ft at 7:00PM Apr 09, 2021Observed: 3.86 ft at 7:15PM Apr 09, 2021Observed: 3.86 ft at 7:30PM Apr 09, 2021Observed: 3.86 ft at 7:45PM Apr 09, 2021Observed: 3.86 ft at 8:00PM Apr 09, 2021Observed: 3.85 ft at 8:15PM Apr 09, 2021Observed: 3.86 ft at 8:30PM Apr 09, 2021Observed: 3.85 ft at 8:45PM Apr 09, 2021Observed: 3.86 ft at 9:00PM Apr 09, 2021Observed: 3.86 ft at 9:15PM Apr 09, 2021Observed: 3.85 ft at 9:30PM Apr 09, 2021Observed: 3.85 ft at 9:45PM Apr 09, 2021Observed: 3.85 ft at 10:00PM Apr 09, 2021Observed: 3.85 ft at 10:15PM Apr 09, 2021Observed: 3.85 ft at 10:30PM Apr 09, 2021Observed: 3.84 ft at 10:45PM Apr 09, 2021Observed: 3.84 ft at 11:00PM Apr 09, 2021Observed: 3.85 ft at 11:15PM Apr 09, 2021Observed: 3.84 ft at 11:30PM Apr 09, 2021Observed: 3.84 ft at 11:45PM Apr 09, 2021Observed: 3.84 ft at 12:00AM Apr 10, 2021Observed: 3.84 ft at 12:15AM Apr 10, 2021Observed: 3.83 ft at 12:30AM Apr 10, 2021Observed: 3.83 ft at 12:45AM Apr 10, 2021Observed: 3.84 ft at 1:00AM Apr 10, 2021Observed: 3.85 ft at 1:15AM Apr 10, 2021Observed: 3.85 ft at 1:30AM Apr 10, 2021Observed: 3.85 ft at 1:45AM Apr 10, 2021Observed: 3.85 ft at 2:00AM Apr 10, 2021Observed: 3.85 ft at 2:15AM Apr 10, 2021Observed: 3.85 ft at 2:30AM Apr 10, 2021Observed: 3.84 ft at 2:45AM Apr 10, 2021Observed: 3.84 ft at 3:00AM Apr 10, 2021Observed: 3.84 ft at 3:15AM Apr 10, 2021Observed: 3.83 ft at 3:30AM Apr 10, 2021Observed: 3.83 ft at 3:45AM Apr 10, 2021Observed: 3.81 ft at 4:00AM Apr 10, 2021Observed: 3.82 ft at 4:15AM Apr 10, 2021Observed: 3.81 ft at 4:30AM Apr 10, 2021Observed: 3.81 ft at 4:45AM Apr 10, 2021Observed: 3.79 ft at 5:00AM Apr 10, 2021Observed: 3.8 ft at 5:15AM Apr 10, 2021Observed: 3.82 ft at 5:30AM Apr 10, 2021Observed: 3.83 ft at 5:45AM Apr 10, 2021Observed: 3.85 ft at 6:00AM Apr 10, 2021Observed: 3.85 ft at 6:15AM Apr 10, 2021Observed: 3.86 ft at 6:30AM Apr 10, 2021Observed: 3.87 ft at 6:45AM Apr 10, 2021Observed: 3.86 ft at 7:00AM Apr 10, 2021Observed: 3.87 ft at 7:15AM Apr 10, 2021Observed: 3.86 ft at 7:30AM Apr 10, 2021Observed: 3.85 ft at 7:45AM Apr 10, 2021Observed: 3.86 ft at 8:00AM Apr 10, 2021Observed: 3.82 ft at 8:15AM Apr 10, 2021Observed: 3.75 ft at 8:30AM Apr 10, 2021Observed: 3.73 ft at 8:45AM Apr 10, 2021Observed: 3.72 ft at 9:00AM Apr 10, 2021Observed: 3.72 ft at 9:15AM Apr 10, 2021Observed: 3.72 ft at 9:30AM Apr 10, 2021Observed: 3.73 ft at 9:45AM Apr 10, 2021Observed: 3.74 ft at 10:00AM Apr 10, 2021Observed: 3.76 ft at 10:15AM Apr 10, 2021Observed: 3.78 ft at 10:30AM Apr 10, 2021Observed: 3.8 ft at 10:45AM Apr 10, 2021Observed: 3.86 ft at 11:00AM Apr 10, 2021Observed: 3.91 ft at 11:15AM Apr 10, 2021Observed: 3.91 ft at 11:30AM Apr 10, 2021Observed: 3.9 ft at 11:45AM Apr 10, 2021Observed: 3.89 ft at 12:00PM Apr 10, 2021Observed: 3.89 ft at 12:15PM Apr 10, 2021Observed: 3.87 ft at 12:30PM Apr 10, 2021Observed: 3.87 ft at 12:45PM Apr 10, 2021Observed: 3.88 ft at 1:00PM Apr 10, 2021Observed: 3.92 ft at 1:15PM Apr 10, 2021Observed: 3.91 ft at 1:30PM Apr 10, 2021Observed: 3.9 ft at 1:45PM Apr 10, 2021Observed: 3.89 ft at 2:00PM Apr 10, 2021Observed: 3.89 ft at 2:15PM Apr 10, 2021Observed: 3.9 ft at 2:30PM Apr 10, 2021Observed: 3.89 ft at 2:45PM Apr 10, 2021Observed: 3.89 ft at 3:00PM Apr 10, 2021Observed: 3.89 ft at 3:15PM Apr 10, 2021Observed: 3.89 ft at 3:30PM Apr 10, 2021Observed: 3.88 ft at 3:45PM Apr 10, 2021Observed: 3.88 ft at 4:00PM Apr 10, 2021Observed: 3.88 ft at 4:15PM Apr 10, 2021Observed: 3.89 ft at 4:30PM Apr 10, 2021Observed: 3.88 ft at 4:45PM Apr 10, 2021Observed: 3.88 ft at 5:00PM Apr 10, 2021Observed: 3.89 ft at 5:15PM Apr 10, 2021Observed: 3.89 ft at 5:30PM Apr 10, 2021Observed: 3.89 ft at 5:45PM Apr 10, 2021Observed: 3.9 ft at 6:00PM Apr 10, 2021Observed: 3.9 ft at 6:15PM Apr 10, 2021Observed: 3.91 ft at 6:30PM Apr 10, 2021Observed: 3.92 ft at 6:45PM Apr 10, 2021USGS--Water Resources of the United StatesGLNS2(plotting HGIRG) Graph Created (7:23PM Apr 10, 2021)ObservedLatest observed value: 3.92 ft at 6:45 PM MDT 10-Apr-2021. Flood Stage is 7.5 ft
About this graph
Tabular Data (UTC)
Tabular Data (MDT)
XML Data
RSS Files
Datum: NGVD29
Metadata
NOTE: Forecasts are not available for the Grizzly Bear Creek near Keystone. Only observed stages are available for this point.
Return to Area Map
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) 5.71 ft on 05/28/2019
(2) 5.42 ft on 07/18/2018
(3) 3.69 ft on 06/05/2017
(4) 5.78 ft on 05/20/2016
(5) 1.61 ft on 05/01/2016
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.

Zoom Level:14
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
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 Collapse

Latitude: 43.878056° N, Longitude: 103.437222° 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 Not Available Not Available Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29 4510 ft 4515 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:

Resources Collapse
Hydrologic Resources Additional Resources
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
Ask Questions/Webmaster
Page last modified: 2-Nov-2020 7:28 PM
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