Coolidge Creek Dam is an earth dam located in Winnebago County, Illinois, built in 1998. It carries a Low hazard potential classification.
Dam profile
NID height · 22 ft22 ft tall and 1,600 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 Coolidge Creek Dam
The primary purpose of Coolidge Creek Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Westlake Village Master Homeowners Association (private). It impounds the Coolidge Creek near Pecatonica.
The dam stands 22 feet tall and stretches 1,600 feet across, creates a reservoir covering 83 acres, has a maximum storage capacity of 1,620 acre-feet, and collects water from a drainage area of 10 square miles. Completed in 1998, the structure is 28 years 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. An emergency action plan is in place for this dam. The most recent inspection on record was 07/11/2024.
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Location
| State | Illinois |
| County | Winnebago |
| Nearest City | Pecatonica |
| River/Stream | Coolidge Creek |
| Coordinates | 42.31709, -89.28467 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 22 ft |
| Dam Height | 22 ft |
| Dam Length | 1,600 ft |
| Year Completed | 1998 (28 years old) |
Storage & Hydraulics
| NID Storage | 1,620 acre-ft |
| Max Storage | 1,620 acre-ft |
| Normal Storage | 507 acre-ft |
| Surface Area | 83 acres |
| Drainage Area | 10 sq mi |
| Max Discharge | 5,860 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Westlake Village Master Homeowners Association |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 07/11/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | IL50386 |
| Federal ID | IL50386 |
| More Info | State Dam Safety Program |