40D-6-6-09-7998
The locks constructuion was started in 1895 and compeleted in 1909. The lock was used for trading boats to enter Bayou Plaquemine from the Mississippi River.
It is now a state park, with a walkway and park.

See the following link for additional information

http://www.crt.state.la.us/Parks/iPlaqlock.aspx