Mississippi River Locks and Dam 27

Madison County, Missouri (near GRANITE CITY)

River/Stream: MISSISSIPPI RIVER

Significant Hazard

Failure could cause economic loss or disruption

Key Facts

Dam Type
Rockfill
Height
25 ft
Dam Length
3,240 ft
Reservoir Storage
50 acre-ft
Year Completed
1962
Primary Purpose
Navigation
Owner Type
Federal
Max Discharge
1,300,000 cfs

Condition Assessment

Not AvailableLast inspected: 2024-05-14

Hazard Classification: Significant — This describes the potential consequences of dam failure, not the likelihood of failure.

Condition Assessment: Not Available — This describes the current physical condition of the dam based on the most recent inspection.

Location

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Data sourced from the National Inventory of Dams (NID). Information may not reflect the most current status of this dam. Hazard classification reflects potential consequences of failure, not the likelihood of failure or the current condition.