Roundhouse Lake Dam is an earth dam located in Knox County, Illinois, built in 1934. It carries a Significant hazard potential classification.
Dam profile
NID height · 35 ft35 ft tall and 320 ft long, taller than 80% 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 Roundhouse Lake Dam
The primary purpose of Roundhouse Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by New Windsor Sportsmans Club (private). It impounds the Trib Sugar Creek near Elmore.
The dam stands 35 feet tall and stretches 320 feet across, and has a maximum storage capacity of 467 acre-feet. Completed in 1934, 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. The most recent inspection on record was 03/28/2024.
At 35 feet, this dam is taller than 80% of dams nationwide.
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Location
| State | Illinois |
| County | Knox |
| Nearest City | Elmore |
| River/Stream | Trib Sugar Creek |
| Coordinates | 41.00814, -90.12864 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 35 ft |
| Dam Height | 35 ft |
| Dam Length | 320 ft |
| Year Completed | 1934 (92 years old) |
Storage & Hydraulics
| NID Storage | 467 acre-ft |
| Max Storage | 467 acre-ft |
| Normal Storage | 316 acre-ft |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | New Windsor Sportsmans Club |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 03/28/2024 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL00419 |
| Federal ID | IL00419 |
| More Info | State Dam Safety Program |