“Sector gates” a peculiar term. That’s what they called the unique gate system of the Thomas J O’Brien Lock & Controlling Works. This isn’t just any lock. It’s a crucial part of Chicago’s impressive waterway system. Linking the Great Lakes to the Mississippi River. The Thomas J O’Brien Lock & Controlling Works stands as a testament to engineering prowess. It ensures smooth navigation and flood control for the Calumet River.
The lock itself is enormous. Imagine a chamber 1000 feet long and 110 feet wide. It can lift vessels up to five feet. The impressive structure is named after Thomas J O’Brien a long-serving US Representative for Illinois. He championed infrastructure projects like this one. The lock is part of a larger network. The Chicago Area Waterway System links the Great Lakes and the Mississippi. This connection is vital for commerce and trade.
Construction of the Thomas J O’Brien Lock & Controlling Works began in 1957. It was completed in 1960 though the lock didn’t open until 1965. This delay wasn’t due to technical problems. It waited for the decommissioning of the older Blue Island Lock. The new lock’s location seven miles upstream was carefully chosen. It improved control of backflow during storms. It also addressed pollution from industries along the Calumet River.
The Thomas J O’Brien Lock & Controlling Works uses sector gates. These gates are curved. Their design reduced construction costs. They were also more efficient. They are uniquely suited for waterways with reversing currents. The dam itself measures 293 feet. It also includes four vertical sluice gates. These gates help regulate water flow. They are used for flood control.
Today the Thomas J O’Brien Lock & Controlling Works continues to operate. It helps maintain a nine-foot navigation channel. This is vital for the passage of barges and other vessels. It’s a silent giant that plays a critical role. It connects Chicago to a vast network of waterways. It’s a vital piece of infrastructure. It keeps the flow of commerce flowing. And it’s a reminder of the ingenuity of those who built it. The Thomas J O’Brien Lock & Controlling Works stands as a testament to human endeavor. It’s a hidden marvel worth remembering.