Mississippi River at Quincy Lock and Dam 21

The past week

What floods at each level

• 140000 ft

  At this approximate discharge, the Corps will raise the gates out of the water, creating "open river" conditions.

• 26.9 ft

  Missouri Highway 168 east of Palmyra near the BASF plant closes near this height.

• 25.7 ft

  At this height, the lock wall is inundated.

• 25 ft

  Quincy Waterworks inundated.

• 21.9 ft

  Near this level, the lock is closed to navigation. This level will vary with circumstance.

• 14 ft

  Unprotected bottomlands flood.

• 12.3 ft

  This is the upper limit of the target pool level at Lock and Dam 21.

• 12.2 ft

  This is the target pool level for navigation at Lock & Dam 21.

• 12 ft

  At some point between 11.6 to 12.1 feet, the Corps will lift all gates out of the river creating "open river" conditions, corresponding to an approximate discharge of 140,000 cfs.

• 11.8 ft

  This is the lower limit of the target pool level at Lock & Dam 21.

Highest crests on record

More on Mississippi River