Crescent Lake Dam is an earth dam located in Henry County, Illinois, built in 1900. It carries a Significant hazard potential classification.
Dam profile
NID height · 31 ft31 ft tall and 475 ft long, taller than 72% 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 Crescent Lake Dam
The primary purpose of Crescent Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Crescent Lake Club (private). It impounds the Trib MUD Creek, Edwards Creek near Ophiem.
The dam stands 31 feet tall and stretches 475 feet across, and has a maximum storage capacity of 249 acre-feet. Completed in 1900, the structure is over a century 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. The most recent inspection on record was 05/02/2025.
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Location
| State | Illinois |
| County | Henry |
| Nearest City | Ophiem |
| River/Stream | Trib MUD Creek, Edwards Creek |
| Coordinates | 41.20098, -90.36595 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 31 ft |
| Dam Height | 31 ft |
| Dam Length | 475 ft |
| Year Completed | 1900 (126 years old) |
Storage & Hydraulics
| NID Storage | 249 acre-ft |
| Max Storage | 249 acre-ft |
| Normal Storage | 186 acre-ft |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Crescent Lake Club |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 05/02/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL00443 |
| Federal ID | IL00443 |
| More Info | State Dam Safety Program |