Chicago Harbor Lock, Navigation lock at Lake Michigan entrance, Chicago, US
Chicago Harbor Lock is a navigation lock at Lake Michigan's entrance that manages water levels between the lake and the Chicago River. The chamber measures 600 feet long, 80 feet wide, and 22 feet deep, handling both large cargo vessels and smaller recreational boats.
The Sanitary District of Chicago constructed this lock between 1936 and 1938 to control water diversion from Lake Michigan and reverse the Chicago River's flow. The project was part of a broader effort to improve the city's water quality.
The lock links Lake Michigan and the Chicago River, allowing commercial vessels and pleasure boats to pass through all year long. This passage remains central to the region's water transportation and local economy.
The lock operates like a water elevator, taking 12 to 15 minutes to adjust water levels through four sector gates. Visitors can watch the process from the shore or experience it by boat.
The lock handles hundreds of passages daily and ranks among the busiest in the nation for both commercial and recreational traffic. This constant activity makes it a compelling place to watch ships in motion.
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