Mississippi River at Mel Price (Alton) Lock and Dam

The past week

What floods at each level

• 42.7 ft

  This is the RECORD FLOOD LEVEL that was reached on August 1 1993.

• 42 ft

  Near this height U.S. Highway 67 will be completely closed. (MoDOT)

• 40 ft

  Railroad tracks from Wood River to Alton begin to flood.

• 37.6 ft

  Damage begins to Ardent Mills grain bins in Alton within a foot of this height.

• 36.1 ft

  This represents the height of the Lincoln Shields levee just below the Missouri side of the Clark bridge.

• 35.5 ft

  At this approximate stage, Mel Price Lock and Dam must close the lock to navigation. This happened on July 10, 1993.

• 34.5 ft

  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 ft

  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 ft

  Riverfront Park in Alton begins flooding.

• 31.5 ft

  Commercial basements in Alton begin to flood within a foot of this height.

• 30.5 ft

  Bloch Marine Service at the Harbor Point Yacht Club begins flooding within a foot of this level.

• 29.9 ft

  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 ft

  The North Wood River Levee must be closed at this level.

• 28.8 ft

  Highway 100 will begin flooding at Clifton Terrace Street within 2 feet of this height.

• 28.5 ft

  The South Wood River Levee must be closed at this level.

• 27.9 ft

  Missouri Highway 94 from Alta Villa Road to Feltes Drive will be closed near this height.

• 26.6 ft

  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 ft

  Yachtview Drive begins flooding along the entrance to Harbor Point Yacht Club within a foot of this height.

• 25 ft

  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 ft

  Alta Villa Road off of Highway 94 north of West Alton is closed within a foot of this height.

• 23 ft

  Dresser Island Drive floods within a foot of this level.

• 20.8 ft

  Unprotected farm land begins to flood

• 18 ft

  Near this height, Mel Price Lock and Dam will go to "open river" conditions, lifting all gates out of the river.

Highest crests on record

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