| Flood Impacts |
| 40.2 | This level is expected to be met or exceeded on average once every 500 years. |
| 39.6 | This is the RECORD FLOOD LEVEL that was reached on August 1 1993. |
| 38.9 | This level is expected to be met or exceeded on average once every 200 years. |
| 37.8 | This level is expected to be met or exceeded on average once every 100 years. |
| 37.0 | Water reaches the top of the lock wall. Also at this level water completely floods Lock and Dam Park in Winfield. |
| 36.6 | This level is expected to be met or exceeded on average once every 50 years. |
| 35.2 | This level is expected to be met or exceeded on average once every 25 years. |
| 34.3 | This level is expected to be met or exceeded on average once every 20 years. |
| 34.0 | This is the level of the levee protection. Major Flooding Begins. |
| 31.9 | This level is expected to be met or exceeded on average once every 10 years. |
| 30.0 | Moderate flooding begins. |
| 29.0 | Route 96 at Mozier Landing Closes |
| 28.5 | PORTIONS OF COUNTY HIGHWAYS B AND C IN NORTHERN ST CHARLES COUNTY ARE FLOODED |
| 26.4 | This level is expected to be met or exceeded on average once every 2 years. |
| 26.0 | Flood Stage. Minor damages begin. |
| 23.0 | A few local islands begin to flood. |
