| 140000.0 | At this approximate discharge, the Corps will raise the gates out of the water, creating open river conditions. | | 26.9 | Missouri Highway 168 east of Palmyra near the BASF plant closes near this height. | | 25.0 | Quincy Waterworks inundated. | | 23.0 | U.S. Highway Business 61 floods south of LaGrange. | | 21.9 | Near this level, the lock is closed to navigation. This level will vary with circumstance. | | 18.5 | Urban damage begins in LaGrange, MO. | | 18.0 | Moderate flooding begins. | | 17.0 | Flood Stage: Minor flooding begins. | | 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. | | 12.0 | At some point between 11.6 to 12.1 feet, the Corps will lift all gates out of the river creating open river conditions, corresponding to an approximate discharge of 140,000 cfs. | | 11.8 | This is the lower limit of the pool level at Lock & Dam 21. |
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1) 31.30 ft on 07/13/1993
2) 29.59 ft on 06/18/2008
3) 28.90 ft on 04/25/1973
4) 26.55 ft on 05/16/2001
5) 25.30 ft on 10/04/1986
6) 24.80 ft on 04/28/1965
7) 24.40 ft on 04/04/1960
8) 24.40 ft on 05/29/1996
9) 24.20 ft on 04/29/1995
10) 23.90 ft on 06/10/1947
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Low water records are unavailable.
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