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 110 ft wide and 600 ft long with its bottom at an elevation of 518 ft. Normal pool elevation behind the dam is 536 ft. The movable portion of the dam is 1121 ft 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 869 acre, 1 building, 3 structures and 2 objects.