Harrisburg Reservoir Dam
Low HazardNot Available ConditionEmergency Action Plan: No
Location
| State | Illinois |
| County | Saline |
| Nearest City | MUDDY |
| River/Stream | MIDDLE FORK SALINE-OFFSTREAM |
| Coordinates | 37.76298, -88.52659 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 25 ft |
| Dam Height | 25 ft |
| Dam Length | 8,400 ft |
| Year Completed | 1920 (106 years old) |
Storage & Hydraulics
| NID Storage | 887 acre-ft |
| Max Storage | 887 acre-ft |
| Normal Storage | 798 acre-ft |
| Surface Area | 73 acres |
| Drainage Area | 87 sq mi |
| Max Discharge | 50 cfs |
| Spillway Type | None |
Ownership & Safety
| Purpose | Other |
| Owner | CITY OF HARRISBURG |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not Available |
| Last Inspection | 10/16/2025 |
| Emergency Action Plan | No |