Lake in the Hills 2 Dam is an earth dam located in McHenry County, Illinois, built in 1947. It carries a Significant hazard potential classification.
Dam profile
NID height · 15 ft15 ft tall and 635 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 Lake in the Hills 2 Dam
Lake in the Hills 2 Dam is a dam in McHenry, Illinois. 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 15 feet tall and stretches 635 feet across, creates a reservoir covering 130 acres, has a maximum storage capacity of 125 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1947, 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. An emergency action plan is in place for this dam. The most recent inspection on record was 11/01/2023.
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Location
| State | Illinois |
| County | McHenry |
| Nearest City | Lake in the Hills |
| River/Stream | Crystal Creek |
| Coordinates | 42.18011, -88.31097 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 15 ft |
| Dam Height | 15 ft |
| Dam Length | 635 ft |
| Year Completed | 1947 (79 years old) |
Storage & Hydraulics
| NID Storage | 125 acre-ft |
| Max Storage | 125 acre-ft |
| Normal Storage | 80 acre-ft |
| Surface Area | 130 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 1,430 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Other |
| Owner | Village of Lake in the Hills |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 11/01/2023 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | IL01004 |
| Federal ID | IL01004 |
| More Info | State Dam Safety Program |