Four H Memorial Lake Dam is an earth dam located in Piatt County, Illinois, built in 1950. It carries a Low hazard potential classification.
Dam profile
NID height · 32 ft32 ft tall and 455 ft long, taller than 74% 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 Four H Memorial Lake Dam
The primary purpose of Four H Memorial Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by University of Illinois (state). It impounds the Sangamon River-offstream near Decatur.
The dam stands 32 feet tall and stretches 455 feet across, and has a maximum storage capacity of 216 acre-feet. Completed in 1950, 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 05/03/2023.
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Location
| State | Illinois |
| County | Piatt |
| Nearest City | Decatur |
| River/Stream | Sangamon River-offstream |
| Coordinates | 40.00099, -88.65782 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 32 ft |
| Dam Height | 32 ft |
| Dam Length | 455 ft |
| Year Completed | 1950 (76 years old) |
Storage & Hydraulics
| NID Storage | 216 acre-ft |
| Max Storage | 216 acre-ft |
| Normal Storage | 113 acre-ft |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | University of Illinois |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 05/03/2023 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL00144 |
| Federal ID | IL00144 |
| More Info | State Dam Safety Program |