T.J. O'Brien Lock and Dam

Last updated
T. J. OBrien Lock and Dam
T J OBrien Lock and Dam.jpg
Location Hegewisch, Chicago
Purpose Flood control, navigation
Construction began1957
Opening date1960
Construction cost$6,954,700
Built byFitz Simmons & Connell Dredge & Dock Company
Designed by United States Army Corps of Engineers logo.svg United States Army Corps of Engineers
Operator(s) United States Army Corps of Engineers logo.svg United States Army Corps of Engineers Rock Island District
Dam and spillways
Type of dam 4 sluice gates
Impounds Calumet River to Lake Michigan harbor
Length297 feet (91 m)
Reservoir
Normal elevation577 feet (176 m) above sea level

Thomas J. O'Brien Lock & Dam is a stop lock in the Hegewisch neighborhood on the South Side of Chicago at the confluence of the Grand Calumet River and Little Calumet River, which form the Calumet River. It is a component of the Chicago Area Waterway System (CAWS), which is, itself, a part of the Illinois Waterway, which links the Mississippi River and the Great Lakes.

Contents

The Lock & Dam is named for Thomas J. O’Brien, who was a U.S. Representative for the 6th District of Illinois from 1933 to 1938 and again from 1943 to 1964. [1]

Overview

The lock and dam are 326 river miles (525 km) from the Mississippi-Illinois confluence. The lock chamber measures 1,000 by 110 feet (305 m × 34 m) with a maximum lift capability of 5 feet (1.5 m). [1] [2] The lock contains a pair of sector gates at either end, which were chosen as they both reduce the cost of engineering and are more conducive to operations in a waterway which can reverse direction. [1] [3] The dam measures 293 feet (89 m) and includes 4 vertical sluice gates. [4]

The lock and dam are used to maintain a 9-foot navigation channel, and for flood control purposes, primarily to limit diversion from the lake during normal periods, and mitigation of backflows into Lake Michigan during large storm events which reverse the direction of the river. [1]

History

Predating the lock and dam was the Blue Island Lock, constructed at the eastern end of the Cal-Sag Channel in 1922. Nearly as soon as its completion, there was already lobbying by various industries along the waterway to expand the size of the lock, which measured 360 by 50 feet (110 m × 15 m). A report by the United States Army Corps of Engineers (USACE) in 1933 proposed, among other things, expanding the size of the lock to 600 by 110 feet (183 m × 34 m) to improve navigation. [1] It would not be until 1946 when Congress would authorize funding for the improvements to the Cal-Sag Channel. [1] The location of the new lock and dam 7 miles (11 km) upstream from the old controlling works at Blue Island was chosen to improve the ability to control backflow events into the lake during heavy storms from the polluting industries along the Grand Calumet River and Little Calumet River and the outfall of the Calumet Water Reclamation Plant. [5] Construction began in 1957, and was completed in 1960. However, the lock portion was not put into operation until July 1, 1965, when the Blue Island Lock was finally decommissioned. [1] [5]

See also

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References

  1. 1 2 3 4 5 6 7 "Historic American Engineering Record, Illinois Waterway, Thomas J. O'Brien Dam and Control Works, HAER No.IL-164-I" (PDF). National Park Service, Historic American Engineering Record (HAER). National Park Service, U.S. Department of the Interior. Retrieved 13 February 2023.
  2. Thomas J. O’Brien Lock & Dam. U.S. Army Corps of Engineers. Retrieved July 12, 2020.
  3. "Illinois Waterway Map & Profile" (PDF). Rock Island District, U.S. Army Corps of Engineers. U.S. Army Corps of Engineers. Retrieved 13 February 2023.
  4. "Project Factsheet for: Thomas J. O'Brien Lock and Controlling Works, Illinois Waterway, Illinois (Major Rehabilitation)" (PDF). US Army Corps of Engineers Rock Island District Website. United States Army Corps of Engineers. Retrieved 13 February 2023.
  5. 1 2 Larson, John W. (31 December 1979). Those Army Engineers: A History of the Chicago District, U.S. Army Corps of Engineers. U.S. Army Corps of Engineers. p. 243. Retrieved 21 February 2023.

41°39′08″N87°34′02″W / 41.6521°N 87.5672°W / 41.6521; -87.5672