Lake Echon Dam is an earth dam located in Johnson County, Illinois, built in 1968. It carries a Low hazard potential classification.
Dam profile
NID height · 16 ft16 ft tall and 820 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 Lake Echon Dam
The primary purpose of Lake Echon Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Camp Ondessock (private). It impounds the Trib Ozark Creek near Simpson.
The dam stands 16 feet tall and stretches 820 feet across, and has a maximum storage capacity of 178 acre-feet. Completed in 1968, 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 07/26/2024.
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Location
| State | Illinois |
| County | Johnson |
| Nearest City | Simpson |
| River/Stream | Trib Ozark Creek |
| Coordinates | 37.51249, -88.75287 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 16 ft |
| Dam Height | 16 ft |
| Dam Length | 820 ft |
| Year Completed | 1968 (58 years old) |
Storage & Hydraulics
| NID Storage | 178 acre-ft |
| Max Storage | 178 acre-ft |
| Normal Storage | 129 acre-ft |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Camp Ondessock |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 07/26/2024 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL00046 |
| Federal ID | IL00046 |
| More Info | State Dam Safety Program |