| 4655.0 | Dam Crest Elevation | | 4651.7 | Elevation that would produce max discharge through the spillway, 245K cfs. | | 4632.0 | Discharge of 50K cfs over spillway. This is very unlikely and is also the estimated discharge at Rapid City in the 1972 Flood, 28 miles downstream. | | 4621.5 | Reservoir capacity 99K acre ft. Top of flood control zone or when uncontrolled flow over spillway begins. | | 4586.0 | This would be a record high pool elevation | | 4585.0 | Flooding of timber stands adjacent to the reservoir and the marina and other developed recreation facilities on the reservoir. Highest release tolerated downstream. | | 4580.0 | Normal Pool Elevation - Top of Active Conservation | | 4456.1 | Top of Inactive Conservation | | 4440.0 | Top of Dead Pool |
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Historical crests are unavailable.
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Low water records are unavailable.
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