Angostura Reservoir
No watches, warnings or advisories are in effect for this area.
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
- Warning: 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) 06/08/2025 4:15 AM MDTRecord: 3189.4 ftCATEGORY STAGE 
Action 3187.2 ft Reliability of the Forecast:
NOTE: Forecasts are not available. Only observed stages are available for this point.
Stage may be affected by ice.
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
- 3199 - Dam crest elevation.
- 3198.1 - Maximum Water Surface or Top of Surcharge Capacity.
- 3195 - Discharge from the reservoir is about 120,000 cfs with automatic control; higher with high inflows and manual control.
Gauge Info
| Coordinates | 43.3430, -103.438 |
| RFC | MBRFC |
| State | SD |
| WFO | UNR |
| County | Fall River |
| Data Provider(s) | |
| U.S. Bureau of Reclamation | Bureau of Reclamation website |
| U.S. Geological Survey | USGS station 06401000 website |
| U.S. Army Corps of Engineers (USACE) | USACE Website |
Gauge Location
Recent Crests
| 1. | 3186.68 ft | on 05-16-2024 |
| 2. | 3.22 ft | on 07-29-2023 |
| 3. | 3.07 ft | on 06-06-2022 |
| 4. | 3180.96 ft | on 05-17-2022 |
| 5. | 3186.78 ft | on 05-24-2019 |
Recent Crests
| 1. | 3186.68 ft | on 05-16-2024 |
| 2. | 3.22 ft | on 07-29-2023 |
| 3. | 3.07 ft | on 06-06-2022 |
| 4. | 3180.96 ft | on 05-17-2022 |
| 5. | 3186.78 ft | on 05-24-2019 |
| 6. | 3187.14 ft | on 03-22-2019 |
| 7. | 3186.73 ft | on 05-21-2018 |
| 8. | 3185.89 ft | on 05-28-2017 |
| 9. | 3.19 ft | on 04-14-2017 |
| 10. | 3186.76 ft | on 05-22-2016 |
| 11. | 5.36 ft | on 05-11-2016 |
| 12. | 15.91 ft | on 06-07-2015 |
| 13. | 3186.84 ft | on 05-27-2014 |
| 14. | 8.50 ft | on 05-13-2014 |
| 15. | 3.62 ft | on 06-17-2013 |
| 16. | 3178.94 ft | on 06-06-2013 |
| 17. | 3.22 ft | on 05-27-2013 |
| 18. | 3.77 ft | on 06-20-2012 |
| 19. | 3186.00 ft | on 04-20-2012 |
| 20. | 3.61 ft | on 03-06-2012 |
| 21. | 3186.99 ft | on 05-22-2011 |
| 22. | 9.24 ft | on 03-13-2011 |
| 23. | 10.99 ft | on 05-26-2010 |
| 24. | 3187.27 ft | on 05-25-2010 |
| 25. | 3181.49 ft | on 06-21-2009 |
| 26. | 3178.29 ft | on 06-12-2008 |
| 27. | 3169.36 ft | on 05-20-2007 |
| 28. | 3172.07 ft | on 05-22-2006 |
| 29. | 3176.33 ft | on 06-24-2005 |
| 30. | 3179.10 ft | on 04-27-2004 |
| 31. | 3183.78 ft | on 06-22-2003 |
| 32. | 3184.60 ft | on 05-17-2002 |
| 33. | 3186.58 ft | on 06-13-2001 |
| 34. | 10.02 ft | on 04-23-2000 |
| 35. | 3187.33 ft | on 04-23-2000 |
| 36. | 3187.18 ft | on 06-13-1999 |
| 37. | 3187.10 ft | on 06-20-1998 |
| 38. | 3187.16 ft | on 06-04-1997 |
| 39. | 3187.18 ft | on 05-29-1996 |
| 40. | 3187.12 ft | on 06-11-1995 |
| 41. | 3187.03 ft | on 03-09-1994 |
| 42. | 3187.12 ft | on 05-08-1993 |
| 43. | 3183.17 ft | on 04-27-1992 |
| 44. | 10.67 ft | on 06-03-1991 |
| 45. | 3187.62 ft | on 06-02-1991 |
| 46. | 3175.03 ft | on 06-07-1990 |
| 47. | 3173.92 ft | on 05-21-1989 |
| 48. | 3181.08 ft | on 04-11-1988 |
| 49. | 3187.26 ft | on 03-08-1987 |
| 50. | 9.75 ft | on 06-12-1986 |
| 51. | 3187.63 ft | on 06-11-1986 |
| 52. | 3182.92 ft | on 04-22-1985 |
| 53. | 3187.16 ft | on 05-06-1984 |
| 54. | 3187.14 ft | on 05-19-1983 |
| 55. | 3187.24 ft | on 06-16-1982 |
| 56. | 3179.70 ft | on 04-11-1981 |
| 57. | 3187.20 ft | on 03-28-1980 |
| 58. | 3187.16 ft | on 04-17-1979 |
| 59. | 3189.37 ft | on 05-20-1978 |
| 60. | 15.97 ft | on 05-20-1978 |
| 61. | 3179.16 ft | on 05-09-1977 |
| 62. | 3182.14 ft | on 06-25-1976 |
| 63. | 3184.20 ft | on 07-02-1975 |
| 64. | 3187.31 ft | on 04-16-1974 |
| 65. | 3187.29 ft | on 05-09-1973 |
| 66. | 3187.26 ft | on 06-30-1972 |
| 67. | 13.18 ft | on 05-25-1971 |
| 68. | 3188.42 ft | on 05-25-1971 |
| 69. | 3187.24 ft | on 05-19-1970 |
| 70. | 10.16 ft | on 07-21-1969 |
| 71. | 3187.63 ft | on 07-20-1969 |
| 72. | 3187.57 ft | on 06-11-1968 |
| 73. | 10.88 ft | on 06-17-1967 |
| 74. | 3188.00 ft | on 06-17-1967 |
| 75. | 3187.31 ft | on 03-17-1966 |
| 76. | 3187.90 ft | on 06-19-1965 |
| 77. | 9.77 ft | on 06-19-1965 |
| 78. | 3187.30 ft | on 06-21-1964 |
| 79. | 3187.45 ft | on 05-02-1963 |
| 80. | 3189.00 ft | on 06-18-1962 |
| 81. | 13.81 ft | on 06-18-1962 |
| 82. | 3166.40 ft | on 06-21-1961 |
| 83. | 3173.07 ft | on 05-14-1960 |
| 84. | 3180.69 ft | on 10-01-1958 |
| 85. | 3187.41 ft | on 08-01-1958 |
| 86. | 3187.91 ft | on 05-27-1957 |
| 87. | 11.05 ft | on 05-26-1957 |
| 88. | 3187.14 ft | on 10-01-1955 |
| 89. | 3187.37 ft | on 05-20-1955 |
| 90. | 3177.76 ft | on 05-27-1954 |
| 91. | 3182.48 ft | on 10-01-1952 |
| 92. | 3187.09 ft | on 07-18-1952 |
| 93. | 10.40 ft | on 06-22-1947 |
Historic Crests
| 1. | 3189.37 ft | on 05-20-1978 |
| 2. | 3189.00 ft | on 06-18-1962 |
| 3. | 3188.42 ft | on 05-25-1971 |
| 4. | 3188.00 ft | on 06-17-1967 |
| 5. | 3187.91 ft | on 05-27-1957 |
Historic Crests
| 1. | 3189.37 ft | on 05-20-1978 |
| 2. | 3189.00 ft | on 06-18-1962 |
| 3. | 3188.42 ft | on 05-25-1971 |
| 4. | 3188.00 ft | on 06-17-1967 |
| 5. | 3187.91 ft | on 05-27-1957 |
| 6. | 3187.90 ft | on 06-19-1965 |
| 7. | 3187.63 ft | on 07-20-1969 |
| 8. | 3187.63 ft | on 06-11-1986 |
| 9. | 3187.62 ft | on 06-02-1991 |
| 10. | 3187.57 ft | on 06-11-1968 |
| 11. | 3187.45 ft | on 05-02-1963 |
| 12. | 3187.41 ft | on 08-01-1958 |
| 13. | 3187.37 ft | on 05-20-1955 |
| 14. | 3187.33 ft | on 04-23-2000 |
| 15. | 3187.31 ft | on 04-16-1974 |
| 16. | 3187.31 ft | on 03-17-1966 |
| 17. | 3187.30 ft | on 06-21-1964 |
| 18. | 3187.29 ft | on 05-09-1973 |
| 19. | 3187.27 ft | on 05-25-2010 |
| 20. | 3187.26 ft | on 03-08-1987 |
| 21. | 3187.26 ft | on 06-30-1972 |
| 22. | 3187.24 ft | on 06-16-1982 |
| 23. | 3187.24 ft | on 05-19-1970 |
| 24. | 3187.20 ft | on 03-28-1980 |
| 25. | 3187.18 ft | on 06-13-1999 |
| 26. | 3187.18 ft | on 05-29-1996 |
| 27. | 3187.16 ft | on 05-06-1984 |
| 28. | 3187.16 ft | on 04-17-1979 |
| 29. | 3187.16 ft | on 06-04-1997 |
| 30. | 3187.14 ft | on 05-19-1983 |
| 31. | 3187.14 ft | on 10-01-1955 |
| 32. | 3187.14 ft | on 03-22-2019 |
| 33. | 3187.12 ft | on 05-08-1993 |
| 34. | 3187.12 ft | on 06-11-1995 |
| 35. | 3187.10 ft | on 06-20-1998 |
| 36. | 3187.09 ft | on 07-18-1952 |
| 37. | 3187.03 ft | on 03-09-1994 |
| 38. | 3186.99 ft | on 05-22-2011 |
| 39. | 3186.84 ft | on 05-27-2014 |
| 40. | 3186.78 ft | on 05-24-2019 |
| 41. | 3186.76 ft | on 05-22-2016 |
| 42. | 3186.73 ft | on 05-21-2018 |
| 43. | 3186.68 ft | on 05-16-2024 |
| 44. | 3186.58 ft | on 06-13-2001 |
| 45. | 3186.00 ft | on 04-20-2012 |
| 46. | 3185.89 ft | on 05-28-2017 |
| 47. | 3184.60 ft | on 05-17-2002 |
| 48. | 3184.20 ft | on 07-02-1975 |
| 49. | 3183.78 ft | on 06-22-2003 |
| 50. | 3183.17 ft | on 04-27-1992 |
| 51. | 3182.92 ft | on 04-22-1985 |
| 52. | 3182.48 ft | on 10-01-1952 |
| 53. | 3182.14 ft | on 06-25-1976 |
| 54. | 3181.49 ft | on 06-21-2009 |
| 55. | 3181.08 ft | on 04-11-1988 |
| 56. | 3180.96 ft | on 05-17-2022 |
| 57. | 3180.69 ft | on 10-01-1958 |
| 58. | 3179.70 ft | on 04-11-1981 |
| 59. | 3179.16 ft | on 05-09-1977 |
| 60. | 3179.10 ft | on 04-27-2004 |
| 61. | 3178.94 ft | on 06-06-2013 |
| 62. | 3178.29 ft | on 06-12-2008 |
| 63. | 3177.76 ft | on 05-27-1954 |
| 64. | 3176.33 ft | on 06-24-2005 |
| 65. | 3175.03 ft | on 06-07-1990 |
| 66. | 3173.92 ft | on 05-21-1989 |
| 67. | 3173.07 ft | on 05-14-1960 |
| 68. | 3172.07 ft | on 05-22-2006 |
| 69. | 3169.36 ft | on 05-20-2007 |
| 70. | 3166.40 ft | on 06-21-1961 |
| 71. | 15.97 ft | on 05-20-1978 |
| 72. | 15.91 ft | on 06-07-2015 |
| 73. | 13.81 ft | on 06-18-1962 |
| 74. | 13.18 ft | on 05-25-1971 |
| 75. | 11.05 ft | on 05-26-1957 |
| 76. | 10.99 ft | on 05-26-2010 |
| 77. | 10.88 ft | on 06-17-1967 |
| 78. | 10.67 ft | on 06-03-1991 |
| 79. | 10.40 ft | on 06-22-1947 |
| 80. | 10.16 ft | on 07-21-1969 |
| 81. | 10.02 ft | on 04-23-2000 |
| 82. | 9.77 ft | on 06-19-1965 |
| 83. | 9.75 ft | on 06-12-1986 |
| 84. | 9.24 ft | on 03-13-2011 |
| 85. | 8.50 ft | on 05-13-2014 |
| 86. | 5.36 ft | on 05-11-2016 |
| 87. | 3.77 ft | on 06-20-2012 |
| 88. | 3.62 ft | on 06-17-2013 |
| 89. | 3.61 ft | on 03-06-2012 |
| 90. | 3.22 ft | on 05-27-2013 |
| 91. | 3.22 ft | on 07-29-2023 |
| 92. | 3.19 ft | on 04-14-2017 |
| 93. | 3.07 ft | on 06-06-2022 |
Vertical Datum Table
| type | NAVD88 |
|---|---|
| major Flooding | N/A |
| moderate Flooding | N/A |
| minor Flooding | N/A |
| action | 6246.80 ft |
| Latest Value | 6238.97 ft |
| Gauge Zero | 3059.60 ft |
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.
Resources
Hydrologic Resource Links
Additional Resource Links
WFO Information
Weather Forecast Office
Rapid City
300 East Signal Drive
Rapid City, SD 57701-3800
Official Homepage