Lock and Dam No. 17 - Credit: Wikimedia Commons
Lock and Dam No. 17 is a lock and dam located near New Boston, Illinois on the Upper Mississippi River near river mile 437. Its main lock is wide and long with its bottom at an elevation of . Normal pool elevation behind the dam is . The movable portion of the dam is long and consists of 3 roller gates and 8 tainter gates. In 2004, the facility was listed in the National Register of Historic Places as Lock and Dam No. 17 Historic District, #04000177 covering , 1 building, 3 structures and 2 objects. Read more on Wikipedia
Source: en.wikipedia.org