Mauvaise Terre Lake Dam

Morgan County, Illinois (near JACKSONVILLE)

River/Stream: MAUVAISE TERRE CREEK

High Hazard

Failure would likely cause loss of life

Key Facts

Dam Type
Earth
Height
30 ft
Dam Length
850 ft
Reservoir Storage
5,624 acre-ft
Year Completed
1923
Primary Purpose
Recreation
Owner Type
Local Government
Max Discharge
25,539 cfs

Condition Assessment

Not AvailableLast inspected: 2025-08-15

Hazard Classification: High — 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
IL00709
State
Illinois (IL)
Coordinates
39.71881, -90.21702
Age
103 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.