Lock and Dam No. 12

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Mississippi River Lock and Dam number 12.jpg
Lock and Dam No. 12 on the Mississippi River. View is upriver to the north.
Location Bellevue, Iowa / Hanover Township, Jo Daviess County, Illinois, USA
Coordinates 42°15′41.08″N 90°25′12.47″W / 42.2614111°N 90.4201306°W / 42.2614111; -90.4201306Coordinates: 42°15′41.08″N 90°25′12.47″W / 42.2614111°N 90.4201306°W / 42.2614111; -90.4201306
Construction began 1934
Opening date May 13, 1939
Operator(s) United States Army Corps of Engineers
Dam and spillways
Impounds Upper Mississippi River
Length 8,369 feet (2,550.9 m)
Creates Pool 12
Total capacity 92,000 acre·ft (0.113 km3)
Catchment area 82,400 sq mi (213,000 km2)
Lock and Dam No. 12 Historic District
Lock and Dam No. 12 is located in Iowa
Lock and Dam No. 12
Lock and Dam No. 12 is located in the US
Lock and Dam No. 12
Location 401 N. Riverview St., Bellevue, Iowa
Area 101.7 acres (41.2 ha)
Built 1939
Architectural style Other, lock and dam
MPS Upper Mississippi River 9-Foot Navigation Project MPS
NRHP Reference # 04000172[1]
Added to NRHP March 10, 2004

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. It connects to a 200 feet (61.0 m) foot storage yard and continues toward the Illinois shore with a 2,750 feet (838.2 m) non-submersible dike, a 1,200 feet (365.8 m) submersible dike and a 3,130 feet (954.0 m) non-submersible dike. The non-submersible sections are separated from the submersible section with two 120 feet (36.6 m) transitional dikes. The main lock is 110 feet (33.5 m) wide by 600 feet (182.9 m) long. There is also an incomplete auxiliary lock.[2] In 2004, the facility was listed in the National Register of Historic Places as Lock and Dam No. 12 Historic District, #04000172 covering 1,017 acres (4.1 km2), 1 building, 3 structures, and 4 objects.

Lock and dam 12.jpeg

See also[edit]


  1. ^ National Park Service (2010-07-09). "National Register Information System". National Register of Historic Places. National Park Service. 
  2. ^ "Lock & Dam 12" (PDF). U.S. Army Corps of Engineers. Retrieved January 5, 2014. 

External links[edit]

Locks and dams of the Upper Mississippi River
Lock and Dam No. 11
Lock and Dam No. 13