Autumn Rose Lake Dam is an earth dam located in Johnson County, Illinois, built in 1998. It carries a Significant hazard potential classification.
Dam profile
NID height · 32 ft32 ft tall and 940 ft long, taller than 74% 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 Autumn Rose Lake Dam
The primary purpose of Autumn Rose Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Golden Hawk Enterprises (private). It impounds the Little Cache Creek near Bloomfield.
The dam stands 32 feet tall and stretches 940 feet across, creates a reservoir covering 14 acres, has a maximum storage capacity of 180 acre-feet, and collects water from a drainage area of 13 square miles. Completed in 1998, the structure is 28 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. An emergency action plan is in place for this dam. The most recent inspection on record was 11/28/2025.
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Location
| State | Illinois |
| County | Johnson |
| Nearest City | Bloomfield |
| River/Stream | Little Cache Creek |
| Coordinates | 37.48035, -88.86145 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 32 ft |
| Dam Height | 32 ft |
| Dam Length | 940 ft |
| Year Completed | 1998 (28 years old) |
Storage & Hydraulics
| NID Storage | 180 acre-ft |
| Max Storage | 180 acre-ft |
| Normal Storage | 135 acre-ft |
| Surface Area | 14 acres |
| Drainage Area | 13 sq mi |
| Max Discharge | 18 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Golden Hawk Enterprises |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 11/28/2025 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | IL50384 |
| Federal ID | IL50384 |
| More Info | State Dam Safety Program |