| 429.0 | Normal pool level. | | 427.5 | Dam goes up at this pool level. | | 36.0 | Lockmasters house and the lower Corps building at the lock and dam begin flooding. | | 35.5 | LaGrange Road (County Highway 12) is flooded south of LaGrange Lock and Dam. | | 29.5 | La Grange Lock Road (County Road 1730N) is flooded just north of the Lock and Dam. | | 28.8 | County Road 500N south of La Grange is closed due to flooding. | | 24.0 | Extensive wetland acreage south of La Grange begins flooding. | | 23.0 | Adjacent farmland and wetlands begins flooding. Island Road across the river in western Cass County begins flooding. | | 20.5 | The lock wall is completely overtopped. | | 16.5 | The earthen part of the dam is overtopped. |
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1) 34.02 ft on 06/01/1995
2) 32.80 ft on 04/19/1979
3) 32.00 ft on 07/29/1993
4) 32.00 ft on 04/29/1973
5) 32.00 ft on 05/22/2009
6) 30.00 ft on 04/23/1993
7) 29.72 ft on 03/19/2009
8) 29.44 ft on 01/20/2005
9) 29.35 ft on 09/24/2008
10) 26.58 ft on 01/06/2009
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Low water records are unavailable.
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