Beaver Lake Dam is an earth dam located in Grundy County, Illinois, built in 1984. It carries a Significant hazard potential classification.
Dam profile
NID height · 15 ft15 ft tall and 90 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 Beaver Lake Dam
The primary purpose of Beaver Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Goose Lake Association (private). It impounds the Trib Mazon River near Carbon Hill.
The dam stands 15 feet tall and stretches 90 feet across, and has a maximum storage capacity of 771 acre-feet. Completed in 1984, the structure is 42 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 06/14/2023.
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Location
| State | Illinois |
| County | Grundy |
| Nearest City | Carbon Hill |
| River/Stream | Trib Mazon River |
| Coordinates | 41.34016, -88.32147 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 15 ft |
| Dam Height | 15 ft |
| Dam Length | 90 ft |
| Year Completed | 1984 (42 years old) |
Storage & Hydraulics
| NID Storage | 771 acre-ft |
| Max Storage | 771 acre-ft |
| Normal Storage | 456 acre-ft |
| Max Discharge | 4,260 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Goose Lake Association |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 06/14/2023 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | IL50107 |
| Federal ID | IL50107 |
| More Info | State Dam Safety Program |