Lock and Dam No. 11

General Zebulon Pike Lock and Dam No. 11 is a lock and dam located between Dubuque, Iowa, and rural Grant County, Wisconsin, on the Upper Mississippi River.

It was opened to navigation September 14, 1937.

Description
The movable portion of the dam is 1478 ft long and consists of 13 tainter gates and three roller gates. The non-movable part is a 3340 ft long non-overflow earthen dam that connects to the Wisconsin shore.

The main lock is 110 ft wide by 600 ft long. There is also an incomplete auxiliary lock.

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

History
Construction the lock began in February 1934 while the dam was started to be built September 1935. They were completed August 1936 and May 1937 respectively. The system was put into operation on September 14, 1937.

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