Lake Mattoon Dam

Significant HazardNot Available ConditionEmergency Action Plan: Yes

Location

StateIllinois
CountyShelby
Nearest CityEFFINGHAM
River/StreamLITTLE WABASH RIVER
Coordinates39.33331, -88.48173

Physical Characteristics

Dam TypeEarth
NID Height46 ft
Dam Height46 ft
Dam Length2,250 ft
Year Completed1957 (69 years old)

Storage & Hydraulics

NID Storage22,569 acre-ft
Max Storage22,569 acre-ft
Normal Storage11,820 acre-ft
Surface Area980 acres
Drainage Area57 sq mi
Max Discharge28,273 cfs
Spillway TypeUncontrolled

Ownership & Safety

PurposeRecreation
OwnerCITY OF MATTOON
Owner TypeLocal Government
Hazard ClassificationSignificant
Condition AssessmentNot Available
Last Inspection12/09/2025
Emergency Action PlanYes

Identifiers

NID IDIL00141
Federal IDIL00141
More InfoState Dam Safety Program

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