| Flood Impacts |
| 54.0 | The Metro East St Louis and Fish Lake levees which protect 71,000 acres are overtopped. |
| 52.0 | St Louis floodwall is overtopped. |
| 50.6 | This is the 500 year frequency level. |
| 49.6 | This is the RECORD FLOOD LEVEL that was reached on August 1 1993. |
| 49.0 | Hartford Public Water supply is threatened |
| 48.0 | The Harrisonville and Prairie DuPont levees protect 37,360 acres. |
| 47.9 | This level is expected to be met or exceeded on average once every 200 years. |
| 47.7 | The Columbia levee protects 14,000 acres. |
| 46.1 | This river level is expected to be exceeded once in every 100 years |
| 44.1 | Chouteau Island Pump Station begins to flood. Power to the Chouteau Island Pump Station disconnected... The Harrisonville and Columbia Levees are overtopped... |
| 43.2 | This flood level was reached on April 28 1973. |
| 42.0 | Riverview Blvd becomes flooded. |
| 41.1 | This level is expected to be met or exceeded on average once every 20 years. |
| 40.0 | Major flooding begins. At this level the Choteau Island Levee, protecting 2400 acres, is overtopped. |
| 38.5 | This river level is expected to be exceeded once in every 10 years. |
| 36.0 | Railroad tracks become flooded. |
| 35.8 | This level is expected to be met or exceeded on average once every 5 years. |
| 35.0 | Moderate flooding begins. |
| 33.0 | Floodwall at Prairie Street is closed. |
| 31.0 | Water begins entering the downtown parking garage. |
| 30.0 | Floodwall at Lacledes Landing is closed. Also this level is expected to be met or exceeded on average once every 2 years. |
| 26.0 | At 26 feet, several levees protects 2000 acres. |
| 18.5 | Levee parking begins to be inundated. |
| 2.0 | Barge traffic may need to reduce tonnage below this level. |
