Loch Lomond Dam is an earth dam located in Lake County, Illinois, built in 1958. It carries a Significant hazard potential classification.
Dam profile
NID height · 14 ft14 ft tall and 550 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 Loch Lomond Dam
The primary purpose of Loch Lomond Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Loch Lomond Property Owners Association (private). It impounds the Bull Creek near Mundelin.
The dam stands 14 feet tall and stretches 550 feet across, creates a reservoir covering 72 acres, has a maximum storage capacity of 821 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1958, the structure is well into its service life at over 50 years 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. An emergency action plan is in place for this dam. The most recent inspection on record was 03/28/2024.
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Location
| State | Illinois |
| County | Lake |
| Nearest City | Mundelin |
| River/Stream | Bull Creek |
| Coordinates | 42.28014, -88.00478 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 14 ft |
| Dam Height | 14 ft |
| Dam Length | 550 ft |
| Year Completed | 1958 (68 years old) |
Storage & Hydraulics
| NID Storage | 821 acre-ft |
| Max Storage | 821 acre-ft |
| Normal Storage | 140 acre-ft |
| Surface Area | 72 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 2,823 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Loch Lomond Property Owners Association |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 03/28/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | IL00652 |
| Federal ID | IL00652 |
| More Info | State Dam Safety Program |