Johnson Lake Dam
Johnson Lake Dam is an earth dam located in Wayne County, Illinois, built in 2002. It carries a Low hazard potential classification.
About Johnson Lake Dam
The primary purpose of Johnson Lake Dam is debris control. The dam is designed to catch sediment, rocks, and debris carried by flowing water — particularly important in areas prone to mudslides or heavy erosion. The dam is owned by William Johnson (private). It impounds the Trib Endsley Creek near Enterprise.
The dam stands 20 feet tall and stretches 400 feet across, creates a reservoir covering 7 acres, has a maximum storage capacity of 110 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 2002, 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 07/29/2025.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Illinois |
| County | Wayne |
| Nearest City | Enterprise |
| River/Stream | Trib Endsley Creek |
| Coordinates | 38.56387, -88.40022 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Dam Length | 400 ft |
| Year Completed | 2002 (24 years old) |
Storage & Hydraulics
| NID Storage | 110 acre-ft |
| Max Storage | 110 acre-ft |
| Normal Storage | 70 acre-ft |
| Surface Area | 7 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 213 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Debris Control |
| Owner | WILLIAM JOHNSON |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not Available |
| Last Inspection | 07/29/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL50436 |
| Federal ID | IL50436 |
| More Info | State Dam Safety Program |