| Flood Impacts |
| 51.2 | This level is expected to be met or exceeded on average once every 500 years. |
| 50.2 | This level is expected to be met or exceeded on average once every 200 years. |
| 50.0 | Ft. Chartess... Ivy Landing and Kaskaskia Island levees overtopped. |
| 49.7 | This is the RECORD FLOOD LEVEL that was reached on August 7 1993. |
| 49.4 | Stringtown and Prairie DuRocher levees overtopped. |
| 49.0 | Degognia and Fountain Bluff Levee overtopped. |
| 48.0 | This river level is expected to be exceeded on average once in every 100 years. |
| 47.5 | Mill on IL Route 3 floods. |
| 47.0 | Menard Correctional Facility floods. |
| 46.1 | This river level is expected to be exceeded once in every 50 years. |
| 45.0 | Highway 51 bridge closes and the waterworks pumphouse floods. |
| 44.0 | Balwin Water Treatment Plant is Flooded |
| 43.3 | This flood level was reached on April 30 1973. |
| 42.3 | This level is expected to be met or exceeded on average once every 25 years. |
| 42.0 | Damage begins at the Menard Prison Water Plant |
| 40.8 | Main Street in Evansville inundated. |
| 40.0 | Ste Genevieve First Presbyterian Church begins to flood. |
| 39.8 | This level is expected to be met or exceeded on average once every 10 years. |
| 39.0 | Illinois Highway 3 south of Chester and Highway 155 near Prairie du Rocher floods. |
| 38.4 | Serious flooding begins in St Marys. Also at this level IL Route 3 at levee east of Cora inundated. |
| 38.3 | This level is expected to be met or exceeded on average once every 10 years. |
| 38.0 | Major flooding begins. Also at this level... Fonda Street in Chester... IL Route 3 in Rockwood and Rockwood homes are flooded. |
| 37.0 | Union Pacific property along Water Street begins to flood. |
| 36.7 | This level is expected to be met or exceeded on average once every 5 years. |
| 36.5 | Chester water intake house is flooded... damage begins to occur to 4 homes and administration buildings at Menard State Prison. Also at this level Route 3 at Rockwood Closes. And Prairie DuRocher pump statioin damaafed and road to Kaskaskia Lock inundated. |
| 36.0 | Water works pumphouse is threatened by flood waters. |
| 35.0 | Ste Genevieve Highway 61 begins to flood. |
| 33.5 | Water Street in Chester is inundated |
| 33.0 | Businesses along the river front begin to flood. |
| 32.0 | Ste Genevieve Main Street begins to flood. |
| 31.6 | Union Pacific RR tracks begin to flood. |
| 31.2 | This level is expected to be met or exceeded on average once every 2 years. |
| 30.0 | Moderate flooding begins. |
| 28.0 | Unleveed islands near Chester and the prison farm floods. |
| 27.0 | Flood Stage. Unprotected farmland on right bank begins to flood. |
| 25.0 | Degognia Gountain Bluff Levee gates are closed. |
