Evergreen Lake Dam is an earth dam located in Macoupin County, Illinois, built in 1953. It carries a Low hazard potential classification.
Dam profile
NID height · 34 ft34 ft tall and 387 ft long, taller than 78% 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 Evergreen Lake Dam
The primary purpose of Evergreen Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Jack Reihl (private). It impounds the Trib West Fork Wood River near Forest Homes.
The dam stands 34 feet tall and stretches 387 feet across, and has a maximum storage capacity of 222 acre-feet. Completed in 1953, 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 06/23/2025.
At 34 feet, this dam is taller than 78% of dams nationwide.
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Location
| State | Illinois |
| County | Macoupin |
| Nearest City | Forest Homes |
| River/Stream | Trib West Fork Wood River |
| Coordinates | 39.02662, -90.10748 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 34 ft |
| Dam Height | 34 ft |
| Dam Length | 387 ft |
| Year Completed | 1953 (73 years old) |
Storage & Hydraulics
| NID Storage | 222 acre-ft |
| Max Storage | 222 acre-ft |
| Normal Storage | 144 acre-ft |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Jack Reihl |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 06/23/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL00773 |
| Federal ID | IL00773 |
| More Info | State Dam Safety Program |