Evergreen Lake Dam
Evergreen Lake Dam is an earth dam located in Woodford County, Illinois, built in 1971. It carries a High hazard potential classification.
About Evergreen Lake Dam
The primary purpose of Evergreen Lake Dam is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by City Of Bloomington (local government). It impounds the Six Mile Creek near Mackinaw.
The dam stands 69 feet tall and stretches 1,780 feet across, and has a maximum storage capacity of 22,875 acre-feet. Completed in 1971, the structure is well into its service life at over 50 years old.
This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. An emergency action plan is in place for this dam. The most recent inspection on record was 11/10/2025.
At 69 feet, this dam is taller than 96% of all dams in the United States.
Living Downstream
If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The Illinois dam safety program can provide more specific information about emergency planning for this structure.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Illinois |
| County | Woodford |
| Nearest City | Mackinaw |
| River/Stream | Six Mile Creek |
| Coordinates | 40.64978, -89.05516 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 69 ft |
| Dam Height | 69 ft |
| Dam Length | 1,780 ft |
| Year Completed | 1971 (55 years old) |
Storage & Hydraulics
| NID Storage | 22,875 acre-ft |
| Max Storage | 22,875 acre-ft |
| Normal Storage | 15,480 acre-ft |
| Max Discharge | 22,870 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | CITY OF BLOOMINGTON |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Not Available |
| Last Inspection | 11/10/2025 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | IL00359 |
| Federal ID | IL00359 |
| More Info | State Dam Safety Program |