Tall Tree Lake Dam is an earth dam located in Johnson County, Illinois, built in 1964. It carries a Low hazard potential classification.
Dam profile
NID height · 29 ft29 ft tall and 1,065 ft long, taller than 65% of U.S. dams with a recorded height. 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 Tall Tree Lake Dam
The primary purpose of Tall Tree Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Audis Gould (private). It impounds the Trib Blue Branch near Karnak.
The dam stands 29 feet tall and stretches 1,065 feet across, and has a maximum storage capacity of 415 acre-feet. Completed in 1964, the structure is well into its service life at over 50 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. The most recent inspection on record was 07/26/2024.
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Location
| State | Illinois |
| County | Johnson |
| Nearest City | Karnak |
| River/Stream | Trib Blue Branch |
| Coordinates | 37.47479, -88.93525 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 29 ft |
| Dam Height | 29 ft |
| Dam Length | 1,065 ft |
| Year Completed | 1964 (62 years old) |
Storage & Hydraulics
| NID Storage | 415 acre-ft |
| Max Storage | 415 acre-ft |
| Normal Storage | 335 acre-ft |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Audis Gould |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 07/26/2024 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL00092 |
| Federal ID | IL00092 |
| More Info | State Dam Safety Program |