Lake Hillsboro Dam

Significant HazardNot Available ConditionEmergency Action Plan: Yes

Location

StateIllinois
CountyMontgomery
Nearest CityHILLSBORO
River/StreamTRIB MIDDLE FORK SHOAL CREEK
Coordinates39.18006, -89.47873

Physical Characteristics

Dam TypeEarth
NID Height34 ft
Dam Height34 ft
Dam Length693 ft
Year Completed1917 (109 years old)

Storage & Hydraulics

NID Storage1,747 acre-ft
Max Storage1,747 acre-ft
Normal Storage879 acre-ft
Surface Area107 acres
Drainage Area6 sq mi
Max Discharge3,276 cfs
Spillway TypeUncontrolled

Ownership & Safety

PurposeRecreation
OwnerCITY OF HILLSBORO
Owner TypeLocal Government
Hazard ClassificationSignificant
Condition AssessmentNot Available
Last Inspection09/18/2025
Emergency Action PlanYes

Identifiers

NID IDIL00699
Federal IDIL00699
More InfoState Dam Safety Program

Nearby Dams

Lake Glenn Shoals Dam 0.4 mi Significant Johnson Pond Dam 1 0.8 mi Low Shoal Creek Structure 5 Dam 2.3 mi High Hillboro Energy/deer Run/crd 2 Dam 2.3 mi High Ekiss Pond Dam 1 2.7 mi Low Hillsboro Energy/deer Run/crd 1 Dam 2.8 mi High Hughes Pond Dam 1 3.1 mi Low American Zinc Smelter Company Large Lake Dam 3.8 mi Significant Shoal Creek Structure 14 Dam 4.4 mi Low Traylor Pond Dam 1 6.7 mi Low