Mirror Lake Dam
Mirror Lake Dam is an earth dam located in Franklin County, Illinois, built in 2001. It carries a Low hazard potential classification.
About Mirror Lake Dam
The primary purpose of Mirror Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Mirror Lake Association (private). It impounds the Trib Middle Fork Big Muddy R near Steel City.
The dam stands 13 feet tall and stretches 600 feet across, creates a reservoir covering 13 acres, has a maximum storage capacity of 99 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 2001, the structure is relatively new.
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 05/06/2022.
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Location
| State | Illinois |
| County | Franklin |
| Nearest City | Steel City |
| River/Stream | Trib Middle Fork Big Muddy R |
| Coordinates | 38.00279, -88.89185 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 13 ft |
| Dam Height | 13 ft |
| Dam Length | 600 ft |
| Year Completed | 2001 (25 years old) |
Storage & Hydraulics
| NID Storage | 99 acre-ft |
| Max Storage | 99 acre-ft |
| Normal Storage | 50 acre-ft |
| Surface Area | 13 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 1,709 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | MIRROR LAKE ASSOCIATION |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not Available |
| Last Inspection | 05/06/2022 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL50427 |
| Federal ID | IL50427 |
| More Info | State Dam Safety Program |