Laharpe Reservoir Dam is an earth dam located in Hancock County, Illinois, built in 1949. It carries a Significant hazard potential classification.
Dam profile
NID height · 15 ft15 ft tall and 1,532 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Laharpe Reservoir Dam
The primary purpose of Laharpe Reservoir Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by City of Laharpe (local government). It impounds the South Branch La Moine River near Laharpe.
The dam stands 15 feet tall and stretches 1,532 feet across, and has a maximum storage capacity of 144 acre-feet. Completed in 1949, the structure is well-established, with more than 75 years of service.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. The most recent inspection on record was 05/30/2023.
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Location
| State | Illinois |
| County | Hancock |
| Nearest City | Laharpe |
| River/Stream | South Branch La Moine River |
| Coordinates | 40.59102, -90.96225 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 15 ft |
| Dam Height | 15 ft |
| Dam Length | 1,532 ft |
| Year Completed | 1949 (77 years old) |
Storage & Hydraulics
| NID Storage | 144 acre-ft |
| Max Storage | 144 acre-ft |
| Normal Storage | 90 acre-ft |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | City of Laharpe |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 05/30/2023 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL00254 |
| Federal ID | IL00254 |
| More Info | State Dam Safety Program |