Eureka Lake Dam is an earth dam located in Woodford County, Illinois, built in 1942. It carries a Significant hazard potential classification.
Dam profile
NID height · 33 ft33 ft tall and 536 ft long, taller than 76% 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 Eureka Lake Dam
The primary purpose of Eureka 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 Eureka (local government). It impounds the Trib Walnut Creek near Eureka.
The dam stands 33 feet tall and stretches 536 feet across, creates a reservoir covering 30 acres, has a maximum storage capacity of 404 acre-feet, and collects water from a drainage area of 3 square miles. Completed in 1942, the structure is well-established, with more than 75 years of service.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. An emergency action plan is in place for this dam. The most recent inspection on record was 07/26/2023.
At 33 feet, this dam is taller than 76% of dams nationwide.
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Location
| State | Illinois |
| County | Woodford |
| Nearest City | Eureka |
| River/Stream | Trib Walnut Creek |
| Coordinates | 40.70512, -89.27704 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 33 ft |
| Dam Height | 33 ft |
| Dam Length | 536 ft |
| Year Completed | 1942 (84 years old) |
Storage & Hydraulics
| NID Storage | 404 acre-ft |
| Max Storage | 404 acre-ft |
| Normal Storage | 290 acre-ft |
| Surface Area | 30 acres |
| Drainage Area | 3 sq mi |
| Max Discharge | 1,271 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | City of Eureka |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 07/26/2023 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | IL00349 |
| Federal ID | IL00349 |
| More Info | State Dam Safety Program |