Harrisburg Reservoir Dam
Harrisburg Reservoir Dam is an earth dam located in Saline County, Illinois, built in 1920. It carries a Low hazard potential classification.
About Harrisburg Reservoir Dam
Harrisburg Reservoir Dam is a dam in Saline, Illinois. The dam is owned by City Of Harrisburg (local government). It impounds the Middle Fork Saline-offstream near Muddy.
The dam stands 25 feet tall and stretches 8,400 feet across, creates a reservoir covering 73 acres, has a maximum storage capacity of 887 acre-feet, and collects water from a drainage area of 87 square miles. Completed in 1920, the structure is over a century old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. The most recent inspection on record was 10/16/2025.
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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 |
Identifiers
| NID ID | IL00960 |
| Federal ID | IL00960 |
| More Info | State Dam Safety Program |