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Chain of Rocks Lock
Mississippi River Lock number 27.jpg
Lock number 27.
Official name Locks 27
Impounds Upper Mississippi River
Locale Granite City, Illinois
Maintained by United States Army Corps of Engineers


Chain of Rocks Lock, also known as Locks #27, is a lock situated on the southern end of Chouteau Island near St. Louis, Missouri on the Upper Mississippi River. Its associated dam is just downstream of the Chain of Rocks Bridge and the lock is located over three miles south east, on the Chain of Rocks canal bypassing an unnavigable portion of the river.

The 1200 feet (366 m) main lock and 600 feet (183 m) auxiliary lock were built in the late 1940s and early 1950s to allow a by-pass of the Chain of Rocks lying in the main channel of the Mississippi River. This stretch of river in low water seasons was treacherous for commercial tow boats and barges, often requiring them to wait up to several days for the river to rise. Lock 27 is the only lock on the Mississippi River System without a man made dam. Tons of rock were laid in the Mississippi to create a small pool elevation upstream from the Chain of Rocks. The drop at Locks 27 can vary from a few feet to over a ten foot drop depending on the river stage.

Locks #27 and the Chain of Rocks canal take traffic around this "chain of rocks", an anticlinal exposure of bedrock in the river north of St. Louis. The low water dam runs on the right of the image starting at the round sheet pile cells at bottom left.

The Chain of Rocks Lock is operated by the St. Louis District of the U.S. Army Corps of Engineers. Locks #27 are the southernmost locks on the Mississippi River and they are the only Locks south of the confluence of the Mississippi River and Missouri River. As such, the Locks move more cargo than any other navigation structure on the Mississippi River.

See also

External links

The Chain of Rocks Canal and Locks in Madison County, Illinois
Locks and dams of the Upper Mississippi River
USAFLSAF123455A67891011121314151617181920212224252627
Upstream:
Melvin Price Locks and Dam
Downstream:
no further locks and dams

Coordinates: 38°42′11″N 90°10′51″W / 38.70306°N 90.18083°W / 38.70306; -90.18083

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Chain of Rocks Lock
File:Mississippi River Lock number
Lock number 27.
Official name Locks 27
Impounds Upper Mississippi River
Locale Madison County, near Granite City, Illinois, USA
Maintained by United States Army Corps of Engineers


Chain of Rocks Lock, also known as Locks #27, is a lock situated on the southern end of Chouteau Island near St. Louis, Missouri on the Upper Mississippi River. Its associated dam is just downstream of the Chain of Rocks Bridge and the lock is located over three miles south east, on the Chain of Rocks canal bypassing an unnavigable portion of the river.

The 1200 feet (366 m) main lock and 600 feet (183 m) auxiliary lock were built in the late 1940s and early 1950s to allow a by-pass of the Chain of Rocks lying in the main channel of the Mississippi River. This stretch of river in low water seasons was treacherous for commercial tow boats and barges, often requiring them to wait up to several days for the river to rise. Lock 27 is the only lock on the Mississippi River System without a man made dam. Tons of rock were laid in the Mississippi to create a small pool elevation upstream from the Chain of Rocks. The drop at Locks 27 can vary from a few feet to over a ten foot drop depending on the river stage.


The Chain of Rocks Lock is operated by the St. Louis District of the U.S. Army Corps of Engineers. Locks #27 are the southernmost locks on the Mississippi River and they are the only Locks south of the confluence of the Mississippi River and Missouri River. As such, the Locks move more cargo than any other navigation structure on the Mississippi River.

See also

External links

Locks and dams of the Upper Mississippi River
USAFLSAF123455A67891011121314151617181920212224252627

Upstream:
Melvin Price Locks and Dam
Downstream:
no further locks and dams

Coordinates: 38°42′11″N 90°10′51″W / 38.70306°N 90.18083°W / 38.70306; -90.18083


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