Marseilles Lock and Dam

LaSalle County, Illinois (near OTTAWA)

River/Stream: ILLINOIS RIVER

Significant Hazard

Failure could cause economic loss or disruption

Key Facts

Dam Type
Concrete
Height
58 ft
Dam Length
2,078 ft
Reservoir Storage
14,000 acre-ft
Year Completed
1933
Primary Purpose
Navigation
Owner Type
Federal
Max Discharge
137,000 cfs

Condition Assessment

Not AvailableLast inspected: 2023-06-21

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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Quick Stats

NID ID
IL00003
State
Illinois (IL)
Coordinates
41.32296, -88.70856
Age
93 years

Nearby Dams

External Resources

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.