Bass Lake Dam is an earth dam located in Lee County, Illinois, built in 1971. It carries a Low hazard potential classification.
Dam profile
NID height · 11 ft11 ft tall and 472 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 Bass Lake Dam
The primary purpose of Bass Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Woodhaven Association (private). It impounds the Trib Green River near Amboy-offstream.
The dam stands 11 feet tall and stretches 472 feet across, and has a maximum storage capacity of 186 acre-feet. Completed in 1971, 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 06/09/2025.
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Location
| State | Illinois |
| County | Lee |
| Nearest City | Amboy-offstream |
| River/Stream | Trib Green River |
| Coordinates | 41.65655, -89.28695 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 11 ft |
| Dam Height | 11 ft |
| Dam Length | 472 ft |
| Year Completed | 1971 (55 years old) |
Storage & Hydraulics
| NID Storage | 186 acre-ft |
| Max Storage | 186 acre-ft |
| Normal Storage | 49 acre-ft |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Woodhaven Association |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 06/09/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL00500 |
| Federal ID | IL00500 |
| More Info | State Dam Safety Program |