Grizzly Bear Creek near Keystone
Future / Actual / Minor
OWP 2.0 WWA Modal Title
01/11/2021, 10:04 PM UTC through 01/11/2021, 10:04 PM UTC
Sender
Sent
- Upstream gauge unavailableDownstream gauge unavailableWarning: no valid ratings curve available. Transformations to and from FEET/CFS/KCFS will not happen.
Traces and Thresholds Click to turn on/off display
Observed (OBS) 06/15/2025 8:40 AM MDTCATEGORY STAGE 
Major Flooding 6 ft Moderate Flooding 5.5 ft Minor Flooding 4.5 ft Action 4 ft Reliability of the Forecast:
NOTE: Forecasts are not available. Only observed stages are available for this point.
National Water Model Hydrograph
Official NWS streamflow forecasts are produced by NWS hydrologic forecasters for river gauge locations using hydrologic models which are calibrated to that location. This process considers additional guidance and information, including local expertise and experience, to produce the best forecast possible. The NWM output provides supplemental guidance to NWS forecasters and should not be considered an official NWS river forecast.
Flood Impacts
- 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.
Gauge Info
| Coordinates | 43.8780, -103.438 |
| RFC | MBRFC |
| State | SD |
| WFO | UNR |
| County | Pennington |
| Data Provider(s) | |
| US Geological Survey (USGS) | USGS station 06403850 |
Gauge Location
Recent Crests
| 1. | 3.89 ft | on 04-07-2024 |
| 2. | 3.33 ft | on 05-14-2023 |
| 3. | 2.93 ft | on 06-07-2022 |
| 4. | 3.53 ft | on 05-23-2021 |
| 5. | 3.13 ft | on 07-05-2020 |
Recent Crests
| 1. | 3.89 ft | on 04-07-2024 |
| 2. | 3.33 ft | on 05-14-2023 |
| 3. | 2.93 ft | on 06-07-2022 |
| 4. | 3.53 ft | on 05-23-2021 |
| 5. | 3.13 ft | on 07-05-2020 |
| 6. | 5.71 ft | on 05-28-2019 |
| 7. | 5.42 ft | on 07-18-2018 |
| 8. | 3.69 ft | on 06-05-2017 |
| 9. | 5.78 ft | on 05-20-2016 |
| 10. | 1.61 ft | on 05-01-2016 |
| 11. | 5.68 ft | on 05-24-2015 |
| 12. | 6.32 ft | on 10-11-2013 |
| 13. | 4.28 ft | on 08-11-2013 |
| 14. | 3.34 ft | on 07-21-2012 |
| 15. | 5.28 ft | on 05-20-2011 |
| 16. | 5.20 ft | on 05-24-2010 |
| 17. | 3.72 ft | on 06-14-2009 |
| 18. | 5.27 ft | on 05-24-2008 |
| 19. | 3.58 ft | on 05-05-2007 |
| 20. | 4.38 ft | on 06-10-2006 |
| 21. | 3.47 ft | on 04-01-2005 |
| 22. | 2.89 ft | on 05-23-2004 |
| 23. | 2.59 ft | on 06-09-2003 |
| 24. | 2.54 ft | on 06-17-2002 |
| 25. | 5.60 ft | on 07-11-2001 |
| 26. | 3.74 ft | on 04-24-2000 |
| 27. | 5.12 ft | on 06-18-1998 |
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 |
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 |
| 6. | 5.42 ft | on 07-18-2018 |
| 7. | 5.28 ft | on 05-20-2011 |
| 8. | 5.27 ft | on 05-24-2008 |
| 9. | 5.20 ft | on 05-24-2010 |
| 10. | 5.12 ft | on 06-18-1998 |
| 11. | 4.38 ft | on 06-10-2006 |
| 12. | 4.28 ft | on 08-11-2013 |
| 13. | 3.89 ft | on 04-07-2024 |
| 14. | 3.74 ft | on 04-24-2000 |
| 15. | 3.72 ft | on 06-14-2009 |
| 16. | 3.69 ft | on 06-05-2017 |
| 17. | 3.58 ft | on 05-05-2007 |
| 18. | 3.53 ft | on 05-23-2021 |
| 19. | 3.47 ft | on 04-01-2005 |
| 20. | 3.34 ft | on 07-21-2012 |
| 21. | 3.33 ft | on 05-14-2023 |
| 22. | 3.13 ft | on 07-05-2020 |
| 23. | 2.93 ft | on 06-07-2022 |
| 24. | 2.89 ft | on 05-23-2004 |
| 25. | 2.59 ft | on 06-09-2003 |
| 26. | 2.54 ft | on 06-17-2002 |
| 27. | 1.61 ft | on 05-01-2016 |
Vertical Datum Table
| type | NAVD88 |
|---|---|
| major Flooding | 4496.87 ft |
| moderate Flooding | 4496.37 ft |
| minor Flooding | 4495.37 ft |
| action | 4494.87 ft |
| Latest Value | 4493.28 ft |
| Gauge Zero | 4490.87 ft |
Probability Information
No Images Available
Collaborative Agencies
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.