| Flood Impacts |
| 429.0 | Normal pool. |
| 427.5 | Dam goes up at this level. |
| 37.3 | This level is expected to be met or exceeded on average once every 500 years. |
| 36.7 | This level is expected to be met or exceeded on average once every 200 years. |
| 36.1 | This level is expected to be met or exceeded on average once every 100 years. |
| 35.0 | This level is expected to be met or exceeded on average once every 50 years. |
| 34.1 | This level is expected to be met or exceeded on average once every 25 years. |
| 34.0 | RECORD FLOOD LEVEL REACHED JUNE 1ST 1995 |
| 32.8 | 2nd highest flood reached April 19th 1979 |
| 31.4 | This level is expected to be met or exceeded on average once every 10 years. |
| 28.6 | This level is expected to be met or exceeded on average once every 5 years. |
| 24.7 | This level is expected to be met or exceeded on average once every 2 years. |
| 23.0 | Flood Stage is Reached |
| 20.5 | The lock wall is completely overtopped. |
| 16.5 | The earthen part of the dam is overtopped. |
