Johnson Lake Dam is an earth dam located in Wayne County, Illinois, built in 2002. It carries a Low hazard potential classification.
Dam profile
NID height · 20 ft20 ft tall and 400 ft long. 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 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.
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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 assessed |
| Last Inspection | 07/29/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL50436 |
| Federal ID | IL50436 |
| More Info | State Dam Safety Program |