Chain of Rocks Lock, Navigation lock on Mississippi River in Madison County, United States
The Chain of Rocks Lock includes a main channel measuring 1,200 feet and an auxiliary lock of 600 feet along the Mississippi River.
Constructed in 1953, the lock was built to help vessels bypass dangerous rocky sections that made river navigation challenging during low water periods.
The lock represents a major achievement in American engineering, demonstrating the adaptation of natural waterways for commercial transportation needs.
This structure processes more cargo shipments than any other navigation facility on the Mississippi River, operating continuously to maintain water traffic flow.
The facility incorporates an 8.4-mile canal system and uses large rock formations as a natural weir instead of traditional dam construction methods.
Location: Madison County
Location: Venice Township
Elevation above the sea: 125 m
GPS coordinates: 38.70310,-90.18080
Latest update: May 11, 2025 14:07
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