From the record
“Lock and Dam No. 12 is a lock and dam located on the Upper Mississippi River at Bellevue, Iowa, United States. The movable portion of the dam starts at the locks adjacent to the Iowa shore and is 849 feet (258.8 m) long, consisting of seven tainter gates and three roller gates.”
Wikipedia article Lock and Dam No. 12, CC BY-SA 4.0.
One of 77 National Register listings published here for Jackson County · listed in 2004 · category: District.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service




