Lake in the Hills 3 Dam is a concrete dam located in McHenry County, Illinois, built in 1940. It carries a Low hazard potential classification.
Dam profile
NID height · 10 ft10 ft tall and 70 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic concrete gravity section and the water level is illustrative.
About Lake in the Hills 3 Dam
The primary purpose of Lake in the Hills 3 Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Village of Lake in the Hills (local government). It impounds the Crystal Creek near Lake in the Hills.
The dam stands 10 feet tall and stretches 70 feet across, creates a reservoir covering 10 acres, has a maximum storage capacity of 70 acre-feet, and collects water from a drainage area of 11 square miles. Completed in 1940, the structure is well-established, with more than 75 years of service.
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 10/29/2024.
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Location
| State | Illinois |
| County | McHenry |
| Nearest City | Lake in the Hills |
| River/Stream | Crystal Creek |
| Coordinates | 42.17952, -88.30916 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 10 ft |
| Dam Height | 10 ft |
| Dam Length | 70 ft |
| Year Completed | 1940 (86 years old) |
Storage & Hydraulics
| NID Storage | 70 acre-ft |
| Max Storage | 70 acre-ft |
| Normal Storage | 10 acre-ft |
| Surface Area | 10 acres |
| Drainage Area | 11 sq mi |
| Max Discharge | 1,550 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Village of Lake in the Hills |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 10/29/2024 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL50382 |
| Federal ID | IL50382 |
| More Info | State Dam Safety Program |