Lake of the Woods Dam is an earth dam located in Peoria County, Illinois, built in 1964. It carries a Significant hazard potential classification.
Dam profile
NID height · 58 ft58 ft tall and 507 ft long, taller than 95% of U.S. dams with a recorded height. Height is drawn to scale against a ten-story building, about 100 ft; the profile is a generic embankment section and the water level is illustrative.
About Lake of the Woods Dam
The primary purpose of Lake of the Woods Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Lake of the Woods HOA (private). It impounds the Trib Dickinson Run near Mossville-offstream.
The dam stands 58 feet tall and stretches 507 feet across, and has a maximum storage capacity of 378 acre-feet. Completed in 1964, 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. The most recent inspection on record was 01/28/2025.
At 58 feet, this dam is taller than 95% of all dams in the United States.
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Location
| State | Illinois |
| County | Peoria |
| Nearest City | Mossville-offstream |
| River/Stream | Trib Dickinson Run |
| Coordinates | 40.84047, -89.60501 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 58 ft |
| Dam Height | 58 ft |
| Dam Length | 507 ft |
| Year Completed | 1964 (62 years old) |
Storage & Hydraulics
| NID Storage | 378 acre-ft |
| Max Storage | 378 acre-ft |
| Normal Storage | 233 acre-ft |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Lake of the Woods HOA |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 01/28/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL00296 |
| Federal ID | IL00296 |
| More Info | State Dam Safety Program |