11 is a lock and dam located between Dubuque, Iowa, and rural Grant County, Wisconsin, on the Upper Mississippi River.

The non-movable part is a 3,340 feet (1,018.0 m) long non-overflow earthen dam that connects to the Wisconsin shore.

[2] The lock and dam are listed on the National Register of Historic Places.

[1] Construction the lock began in February 1934 while the dam was started to be built September 1935.

[3] In December 2015, 200 coots died near the dam and O'Leary Lake.