RIVER GAUGE
Angostura Reservoir
Fall River County, South Dakota
Water level3166.87 ft
Flow—
Last readingSep 16, 2026, 5:15 PM UTC (last recorded)
Action3187.2 ft
The past week
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What floods at each level
- 3199 ft
Dam crest elevation.
- 3198.1 ft
Maximum Water Surface or Top of Surcharge Capacity.
- 3195 ft
Discharge from the reservoir is about 120,000 cfs with automatic control; higher with high inflows and manual control.
- 3187.2 ft
Top of active conservation elevation.
- 3163 ft
Elevation at top of inactive storage.
- 3062 ft
Streambed elevation at dam axis.
Highest crests on record
| Date | Level | Flow |
|---|---|---|
| May 19, 1978 | 3189.37 ft | -9,999 cfs |
| Jun 17, 1962 | 3189 ft | — |
| May 24, 1971 | 3188.42 ft | — |
UpstreamCheyenne River at Edgemont
DownstreamCheyenne River near Buffalo Gap
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