| 42.2 | This is the approximate minimum level of protection provided by the Monarch levee protecting Chesterfield Valley. Since this gage is affected by Mississippi River backwater, the actual level of overtopping may be higher. | | 40.0 | This is the RECORD FLOOD LEVEL that was reached on August 2 1993. | | 38.0 | Floor of the gage house. | | 37.0 | Residences north of St Charles become cut off due to flood waters. | | 36.5 | This flood level was reached on May 21 1995. | | 36.0 | Major flooding begins. The levee at the Highway 370 bridge is overtopped. | | 34.5 | Greens Bottom Road floods. This road connects Pittman Hill Road and Jungs Station Road south of 94. | | 34.0 | Terry Road at Highway 94 (near Matson) floods. | | 33.9 | MK&T Railroad tracks flood. | | 33.5 | Highway 94, downstream of St Charles, floods. | | 33.0 | Up to 7 non-Federal levees are overtopped. (USACE) | | 30.0 | Moderate flooding begins. | | 26.5 | Aubuchon Road begins flooding between Teson Road and Riverwood Estates near this height. | | 26.0 | Highway 94 begins flooding 1.5 miles SW of Matson, MO. | | 25.0 | Flood Stage. Minor flooding begins. The right bank downstream overflows, flooding agricultural bottomland. | | 21.0 | An access road to farmland on Bonhomme Island gets cut off above this height. |
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1) 40.11 ft on 06/24/1884
2) 40.04 ft on 08/02/1993
3) 37.50 ft on 10/07/1986
4) 36.50 ft on 05/21/1995
5) 36.40 ft on 04/26/1973
6) 35.40 ft on 04/15/1994
7) 34.60 ft on 05/19/1990
8) 34.00 ft on 02/26/1985
9) 33.90 ft on 05/04/1983
10) 33.90 ft on 12/07/1982
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1) 0.00 ft on 10/26/2004
2) 0.00 ft on 12/06/2003
3) 3.20 ft on 12/24/1963
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