42.7' - This is the RECORD FLOOD LEVEL that was reached on August 1 1993.
42' - Near this height U.S. Highway 67 will be completely closed. (MoDOT)
40' - Railroad tracks from Wood River to Alton begin to flood.
37.6' - Damage begins to Ardent Mills grain bins in Alton within a foot of this height.
36.1' - This represents the height of the Lincoln Shields levee just below the Missouri side of the Clark bridge.
35.5' - At this approximate stage, Mel Price Lock and Dam must close the lock to navigation. This happened on July 10, 1993.
34.5' - Near this height, the southbound lanes of U.S. Highway 67 will begin flooding, forcing the detour of southbound traffic onto the northbound lanes.
34.2' - Near this height water will begin flowing over Riverlands Way between Highway 67 and Mel Price Locks and Dam. This road is a part of the Consolidated North County levee, so this is the point when water begins gradually flowing onto the protected farmland and farm homes behind the levee.
32.9' - Riverfront Park in Alton begins flooding.
31.5' - Commercial basements in Alton begin to flood within a foot of this height.
30.5' - Bloch Marine Service at the Harbor Point Yacht Club begins flooding within a foot of this level.
29.9' - Route 100 at Alton closes within a foot of this height. Also at this level the north and south Wood River Levee structures are closed.
29.3' - The North Wood River Levee must be closed at this level.
28.8' - Highway 100 will begin flooding at Clifton Terrace Street within 2 feet of this height.
28.5' - The South Wood River Levee must be closed at this level.
27.9' - Missouri Highway 94 from Alta Villa Road to Feltes Drive will be closed near this height.
26.6' - Within a foot of this height, outer road US 67 between Riverlands Way and the Lincoln Shields Access Road will close due to flooding.
26.5' - Yachtview Drive begins flooding along the entrance to Harbor Point Yacht Club within a foot of this height.
25' - Highway 94 and the east end of Harbor Point Road off of Highway 94 north of West Alton begin flooding within a foot or so of this height. Also, the access road to the Lincoln Shields area off Highway 67 just west of the Clark bridge begins flooding.
24' - Alta Villa Road off of Highway 94 north of West Alton is closed within a foot of this height.
23' - Dresser Island Drive floods within a foot of this level.
21' - Flood Stage. Minor flooding begins to occur at this level.
20.8' - Unprotected farm land begins to flood
18' - Near this height, Mel Price Lock and Dam will go to "open river" conditions, lifting all gates out of the river.