Patterson Springs Lake Dam is an earth dam located in Douglas County, Illinois, built in 1945. It carries a Low hazard potential classification.
Dam profile
NID height · 13 ft13 ft tall and 240 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 Patterson Springs Lake Dam
The primary purpose of Patterson Springs Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Spring Lake Corp. (private). It impounds the Trib Embarass River near Hugo-offstream.
The dam stands 13 feet tall and stretches 240 feet across, and has a maximum storage capacity of 50 acre-feet. Completed in 1945, the structure is well-established, with more than 75 years of service.
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 07/07/2023.
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Location
| State | Illinois |
| County | Douglas |
| Nearest City | Hugo-offstream |
| River/Stream | Trib Embarass River |
| Coordinates | 39.79331, -88.18973 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 13 ft |
| Dam Height | 13 ft |
| Dam Length | 240 ft |
| Year Completed | 1945 (81 years old) |
Storage & Hydraulics
| NID Storage | 50 acre-ft |
| Max Storage | 50 acre-ft |
| Normal Storage | 22 acre-ft |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Spring Lake Corp. |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 07/07/2023 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL00882 |
| Federal ID | IL00882 |
| More Info | State Dam Safety Program |