| Flood Impacts | 
										
																					 	 	| 32.2 | Flood of Record - July 13, 1993 | 
 	 	| 30.8 | This level is expected to be met or exceeded on average once every 500 years. | 
 	 	| 30.5 | This level is expected to be met or exceeded on average once every 200 years. | 
 	 	| 28.9 | April 25, 1973 crest | 
 	 	| 27.5 | This level is expected to be met or exceeded on average once every 100 years. | 
 	 	| 25.7 | This level is expected to be met or exceeded on average once every 50 years. | 
 	 	| 25.0 | Quincy Waterworks inundated. | 
 	 	| 23.6 | This level is expected to be met or exceeded on average once every 25 years. | 
 	 	| 23.0 | U.S. Highway 61 floods | 
 	 	| 22.5 | Major flooding begins. | 
 	 	| 22.0 | Major flooding begins. | 
 	 	| 20.7 | This level is expected to be met or exceeded on average once every 10 years. | 
 	 	| 18.5 | Urban damage begins in LaGrange, MO. | 
 	 	| 18.1 | This level is expected to be met or exceeded on average once every 5 years. | 
 	 	| 18.0 | Moderate flooding begins. | 
 	 	| 17.0 | Flood Stage:  Minor flooding begins. | 
 	 	| 15.5 | This level is expected to be met or exceeded on average once every 2 years. | 
 	 	| 14.0 | Unprotected bottomlands flood. | 
 	 	| 12.3 | This is the upper limit of the pool level at Lock and Dam 21. | 
 	 	| 12.2 | This is the target pool level for navigation at Lock & Dam 21. | 
 	 	| 11.8 | This is the lower limit of the pool level at Lock & Dam 21. |