| 42.7 | This is the RECORD FLOOD LEVEL that was reached on August 1 1993. | | 40.0 | Railroad tracks from Wood River to Alton begin to flood. | | 38.6 | Flood waters reach the low steel on RR bridge swing span in Alton. | | 37.6 | Damage begins to Miller Milling Company in Alton. | | 35.5 | At this approximate stage, Mel Price Lock and Dam must close the lock to navigation. This last happened on July 10, 1993. | | 35.0 | Burlington Northern RR floods from West Alton, Missouri to Alton, Illinois. | | 34.0 | Major damage level. Commercial damages begin in Alton. | | 33.0 | Urban flood damage begins in Elsah, Illinois and Portage des Sioux. | | 32.9 | Riverfront Park in Alton begins flooding. | | 31.5 | Commercial basements in Alton begin to flood. | | 30.5 | Bloch Marine Service at the Harbor Point Yacht Club begins flooding near this level. | | 29.9 | Route 100 at Alton closes. Also at this level the north and south Wood River Levee structures are closed. | | 29.5 | Urban flood damage begins in Peruque. | | 29.3 | The North Wood River Levee must be closed at this level. | | 28.8 | When the Missouri River is near 27 feet, Highway 100 will begin flooding at Clifton Terrace Street near this height. | | 28.5 | The South Wood River Levee must be closed at this level. | | 26.5 | Yachtview Drive begins flooding along the entrance to Harbor Point Yacht Club. | | 25.0 | Highway 94 and the east end of Harbor Point Road off of Highway 94 north of West Alton begin flooding. Also, the access road to the Lincoln Shields area off Highway 67 just west of the Clark bridge begins flooding. | | 24.0 | Alta Villa Road off of Highway 94 north of West Alton is closed. | | 23.0 | Dresser Island Drive floods at this level. | | 21.0 | Flood Stage. Minor flooding begins to occur at this level. | | 20.8 | Unprotected farm land begins to flood |
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1) 42.72 ft on 08/01/1993
2) 36.90 ft on 06/18/1844
3) 36.89 ft on 04/28/1973
4) 35.10 ft on 05/22/1995
5) 34.20 ft on 10/09/1986
6) 33.21 ft on 05/01/1983
7) 33.08 ft on 06/30/2008
8) 32.44 ft on 12/08/1982
9) 30.80 ft on 04/18/1993
10) 29.89 ft on 09/18/2008
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1) 0.00 ft on 11/07/1948
2) 0.10 ft on 01/15/2003
3) 3.20 ft on 01/10/1980
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