Lake Hillcrest Dam is an earth dam located in Madison County, Illinois, built in 1956. It carries a Significant hazard potential classification.
Dam profile
NID height · 40 ft40 ft tall and 425 ft long, taller than 86% 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 Lake Hillcrest Dam
The primary purpose of Lake Hillcrest Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Lake Hillcrest Corporation (private). It impounds the Trib Cahokia Creek near Glen Carbon-offstream.
The dam stands 40 feet tall and stretches 425 feet across, creates a reservoir covering 14 acres, has a maximum storage capacity of 355 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1956, 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. An emergency action plan is in place for this dam. The most recent inspection on record was 05/13/2022.
At 40 feet, this dam is taller than 86% of dams nationwide.
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Location
| State | Illinois |
| County | Madison |
| Nearest City | Glen Carbon-offstream |
| River/Stream | Trib Cahokia Creek |
| Coordinates | 38.74938, -89.99365 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 40 ft |
| Dam Height | 40 ft |
| Dam Length | 425 ft |
| Year Completed | 1956 (70 years old) |
Storage & Hydraulics
| NID Storage | 355 acre-ft |
| Max Storage | 355 acre-ft |
| Normal Storage | 189 acre-ft |
| Surface Area | 14 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 346 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Lake Hillcrest Corporation |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 05/13/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | IL00192 |
| Federal ID | IL00192 |
| More Info | State Dam Safety Program |