| 640.0 | Water begins to go over the protective earthen dikes. | | 639.0 | Water begins to flow over lock walls. | | 638.4 | Water levels reach the flood of record. | | 636.0 | Lock and dam 8 is closed to navigation. |
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1) 638.40 ft on 04/22/1965
2) 636.45 ft on 04/12/1997
3) 636.21 ft on 04/18/2001
4) 635.24 ft on 04/20/1969
5) 634.52 ft on 04/20/1952
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1) 615.30 ft on 08/18/1936
2) 616.09 ft on 10/09/1937
3) 617.39 ft on 01/21/1938
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