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.
Dam profile
NID height · 37 ft37 ft tall and 380 ft long, taller than 83% of U.S. dams with a recorded height. 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 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 83% 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 assessed |
| Last Inspection | 02/01/2024 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL00766 |
| Federal ID | IL00766 |
| More Info | State Dam Safety Program |