Structure No. 12 is an earth dam located in Johnson County, Illinois, built in 1974. It carries a Significant hazard potential classification.
Dam profile
NID height · 54 ft54 ft tall and 1,450 ft long, taller than 94% of U.S. dams with a recorded height. Height is drawn to scale against a ten-story building, about 100 ft; the profile is a generic embankment section and the water level is illustrative.
About Structure No. 12
The primary purpose of Structure No. 12 is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Usda Fs (federal). It impounds the Dutchman Creek.
The dam stands 54 feet tall and stretches 1,450 feet across, creates a reservoir covering 186 acres, has a maximum storage capacity of 4,432 acre-feet, and collects water from a drainage area of 11 square miles. Completed in 1974, the structure is well into its service life at over 50 years 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 09/23/2016. That was over 10 years ago.
At 54 feet, this dam is taller than 94% of dams nationwide.
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Location
| State | Illinois |
| County | Johnson |
| Nearest City | None |
| River/Stream | Dutchman Creek |
| Coordinates | 37.49002, -88.74420 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 54 ft |
| Dam Height | 54 ft |
| Dam Length | 1,450 ft |
| Year Completed | 1974 (52 years old) |
Storage & Hydraulics
| NID Storage | 4,432 acre-ft |
| Max Storage | 4,432 acre-ft |
| Normal Storage | 1,355 acre-ft |
| Surface Area | 186 acres |
| Drainage Area | 11 sq mi |
| Max Discharge | 13,728 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Usda Fs |
| Owner Type | Federal |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 09/23/2016 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IL00038 |
| Federal ID | IL00038 |
| More Info | State Dam Safety Program |