Eureka Lake is an earth dam located in McPherson County, South Dakota, built in 1962. It carries a Significant hazard potential classification.
Dam profile
NID height · 15 ft15 ft tall and 1,650 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 Eureka Lake
The primary purpose of Eureka Lake is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by City of Eureka (local government). It impounds the Tr Spring.
The dam stands 15 feet tall and stretches 1,650 feet across, and has a maximum storage capacity of 594 acre-feet. Completed in 1962, the structure is well into its service life at over 50 years old.
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.
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Location
| State | South Dakota |
| County | McPherson |
| Nearest City | None |
| River/Stream | Tr Spring |
| Coordinates | 45.76850, -99.63769 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 15 ft |
| Dam Height | 15 ft |
| Dam Length | 1,650 ft |
| Year Completed | 1962 (64 years old) |
Storage & Hydraulics
| NID Storage | 594 acre-ft |
| Max Storage | 594 acre-ft |
| Normal Storage | 594 acre-ft |
Ownership & Safety
| Purpose | Recreation |
| Owner | City of Eureka |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD00666 |
| Federal ID | SD00666 |
| More Info | State Dam Safety Program |