Washington County Lake Dam is an earth dam located in Washington County, Illinois, built in 1962. It carries a Low hazard potential classification.
Dam profile
NID height · 26 ft26 ft tall and 640 ft long, taller than 55% 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 Washington County Lake Dam
The primary purpose of Washington County Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Illinois Department of Natural Resources (state). It impounds the Locust Creek near Pinkneyville.
The dam stands 26 feet tall and stretches 640 feet across, and has a maximum storage capacity of 4,232 acre-feet. Completed in 1962, 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 07/22/2024.
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Location
| State | Illinois |
| County | Washington |
| Nearest City | Pinkneyville |
| River/Stream | Locust Creek |
| Coordinates | 38.26905, -89.36143 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 26 ft |
| Dam Height | 26 ft |
| Dam Length | 640 ft |
| Year Completed | 1962 (64 years old) |
Storage & Hydraulics
| NID Storage | 4,232 acre-ft |
| Max Storage | 4,232 acre-ft |
| Normal Storage | 1,404 acre-ft |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Illinois Department of Natural Resources |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 07/22/2024 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL00139 |
| Federal ID | IL00139 |
| More Info | State Dam Safety Program |