Timber Lake Dam is an earth dam located in Lake County, Illinois, built in 1949. It carries a Low hazard potential classification.
Dam profile
NID height · 20 ft20 ft tall and 320 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 Timber Lake Dam
The primary purpose of Timber Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Michael Graff (private). It impounds the Trib Tower Lake near Tower Lake.
The dam stands 20 feet tall and stretches 320 feet across, and has a maximum storage capacity of 292 acre-feet. Completed in 1949, 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 07/16/2024.
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Location
| State | Illinois |
| County | Lake |
| Nearest City | Tower Lake |
| River/Stream | Trib Tower Lake |
| Coordinates | 42.24011, -88.12868 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Dam Length | 320 ft |
| Year Completed | 1949 (77 years old) |
Storage & Hydraulics
| NID Storage | 292 acre-ft |
| Max Storage | 292 acre-ft |
| Normal Storage | 240 acre-ft |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Michael Graff |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 07/16/2024 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL00632 |
| Federal ID | IL00632 |
| More Info | State Dam Safety Program |