Johnson Sauk Trail Lake Dam is an earth dam located in Henry County, Illinois, built in 1956. It carries a Low hazard potential classification.
Dam profile
NID height · 38 ft38 ft tall and 563 ft long, taller than 84% 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 Johnson Sauk Trail Lake Dam
The primary purpose of Johnson Sauk Trail Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Illinois Department of Natural Resources (state). It impounds the Trib King Creek near Mineral.
The dam stands 38 feet tall and stretches 563 feet across, and has a maximum storage capacity of 752 acre-feet. Completed in 1956, the structure is well into its service life at over 50 years old.
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 05/14/2025.
At 38 feet, this dam is taller than 84% of dams nationwide.
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Location
| State | Illinois |
| County | Henry |
| Nearest City | Mineral |
| River/Stream | Trib King Creek |
| Coordinates | 41.32834, -89.88327 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 38 ft |
| Dam Height | 38 ft |
| Dam Length | 563 ft |
| Year Completed | 1956 (70 years old) |
Storage & Hydraulics
| NID Storage | 752 acre-ft |
| Max Storage | 752 acre-ft |
| Normal Storage | 339 acre-ft |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Illinois Department of Natural Resources |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 05/14/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL00892 |
| Federal ID | IL00892 |
| More Info | State Dam Safety Program |