Old Mt. Olive City Lake Dam
Old Mt. Olive City Lake Dam is an earth dam located in Macoupin County, Illinois, built in 1900. It carries a Significant hazard potential classification.
About Old Mt. Olive City Lake Dam
The primary purpose of Old Mt. Olive City Lake 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 Mount Olive (local government). It impounds the Sugar Creek near Staunton-offstream.
The dam stands 37 feet tall and stretches 380 feet across, creates a reservoir covering 37 acres, has a maximum storage capacity of 539 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1900, the structure is over a century old.
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 02/01/2024.
At 37 feet, this dam is taller than 84% of dams nationwide.
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Location
| State | Illinois |
| County | Macoupin |
| Nearest City | Staunton-offstream |
| River/Stream | Sugar Creek |
| Coordinates | 39.08497, -89.74667 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 37 ft |
| Dam Height | 37 ft |
| Dam Length | 380 ft |
| Year Completed | 1900 (126 years old) |
Storage & Hydraulics
| NID Storage | 539 acre-ft |
| Max Storage | 539 acre-ft |
| Normal Storage | 411 acre-ft |
| Surface Area | 37 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 1,414 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | CITY OF MOUNT OLIVE |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Not Available |
| Last Inspection | 02/01/2024 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL00766 |
| Federal ID | IL00766 |
| More Info | State Dam Safety Program |