| 33.3 | Flood waters reach the instrument shelf of the manometer gage house. | | 30.5 | Flood waters reach the floor of the gage house. | | 27.5 | Near this level, the left bank levee just south of the U.S. Highway 51 bridge is overtopped. | | 27.4 | This is the RECORD FLOOD LEVEL that was reached on April 30 1996. | | 26.0 | Major flooding begins. The Dively and Vandalia Levees begin to be overtopped. | | 25.8 | Along South 4th Street, numerous homes begin flooding near the St. Clair Street intersection. | | 25.5 | South 4th Street begins flooding near and south of Jefferson Street in Vandalia. | | 24.0 | Moderate flooding begins. | | 23.0 | Agricultural levee begins to be slightly overtopped. No residences are affected at this level. | | 18.0 | Flood Stage. Minor flooding begins. Unprotected farmland begins to flood. |
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1) 28.30 ft on 05/08/2002
2) 27.70 ft on 01/06/2005
3) 27.41 ft on 04/30/1996
4) 27.40 ft on 05/18/1995
5) 27.39 ft on 06/29/1951
6) 27.10 ft on 01/04/1950
7) 26.95 ft on 02/24/1985
8) 26.71 ft on 12/12/1985
9) 26.57 ft on 04/13/1994
10) 26.48 ft on 03/20/2008
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1) 0.00 ft on 08/22/1911
2) 0.50 ft on 05/01/1980
3) 2.08 ft on 10/21/1999
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