Citizens Lake Dam is an earth dam located in Warren County, Illinois, built in 1878. It carries a Low hazard potential classification.
Dam profile
NID height · 20 ft20 ft tall and 353 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 Citizens Lake Dam
The primary purpose of Citizens Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by City of Monmouth (local government). It impounds the Trib Cedar Creek near Monmouth-offstream.
The dam stands 20 feet tall and stretches 353 feet across, and has a maximum storage capacity of 73 acre-feet. Completed in 1878, the structure is over a century old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. The most recent inspection on record was 07/21/2024.
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Location
| State | Illinois |
| County | Warren |
| Nearest City | Monmouth-offstream |
| River/Stream | Trib Cedar Creek |
| Coordinates | 40.90867, -90.66556 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Dam Length | 353 ft |
| Year Completed | 1878 (148 years old) |
Storage & Hydraulics
| NID Storage | 73 acre-ft |
| Max Storage | 73 acre-ft |
| Normal Storage | 42 acre-ft |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | City of Monmouth |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 07/21/2024 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL00471 |
| Federal ID | IL00471 |
| More Info | State Dam Safety Program |