| 633.2 | Water levels reach the flood of record. | | 633.0 | Water begins to flow over the lock walls and the protective earthen dikes. | | 631.0 | Lock and dam 9 is closed to navigation. |
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1) 633.16 ft on 04/24/1965
2) 631.22 ft on 04/21/2001
3) 631.05 ft on 04/14/1997
4) 629.42 ft on 04/22/1969
5) 629.08 ft on 06/30/1993
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1) 606.94 ft on 08/20/1936
2) 607.65 ft on 07/28/1937
3) 610.20 ft on 12/09/1939
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