Lock and Dam No. 12

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Lock and Dam No. 12

Lock and Dam No. 12 on the Mississippi River. View is upriver to the north.
Impounds Upper Mississippi River
Creates Pool 12
Locale Bellevue, Iowa
Maintained by United States Army Corps of Engineers
Length 8,369 feet (2,550.9 m)
Construction began 1934
Opening date May 13, 1939

Lock and Dam No. 12 is a lock and dam located on the Upper Mississippi River at Bellevue, Iowa. 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 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 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. 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.

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Locks and dams of the Upper Mississippi River
USAF • LSAF • 1 • 2 • 3 • 4 • 5 • 5A • 6 • 7 • 8 • 9 • 10 • 11 • 12 • 13 • 14 • 15 • 16 • 17 • 18 • 19 • 20 • 21 • 22 • 24 • 25 • 26 • 27
Upstream:
Lock and Dam No. 11		 Downstream:
Lock and Dam No. 13
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