Lock and Dam No. 12

Lock and Dam No. 12 ( lock and dam No. 12) is one of 29 dams that enable navigation on the upper Mississippi. Built in 1934-1938 by the United States Army Corps of Engineers combined building is located between Bellevue, Iowa and Jo Daviess County in Illinois. In 2004, the Lock and Dam No. was. 12 Historic District was added to the NRHP.

Barrage

To barrage includes a stone dam on the Illinois side, and a 258.8 m long variable part, which consists of a seven- segment Defense and three jam rolls.

The dam height is nine feet (2.70 m). The purpose of the weir is not in the first line of flood protection, but the damming of the Mississippi for navigation.

Lock

The lock is 182.9 m long and 33.5 m wide. Next to it is a second, but not finished smaller lock chamber.

Bellevue (Iowa) Jo Daviess County, Illinois Roller dam Lock and Dam No. 10 Lock and Dam No. 11 Lock and Dam No. 13 Lock and Dam No. 14 Lock and Dam No. 15 Lock and Dam No. 16 Lock and Dam No. 21 Lock and Dam No. 22 Lock and Dam No. 24 Lock and Dam No. 25 Melvin Price Locks and Dam Chain of Rocks Lock
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