Hooper Lake Dam is an earth dam located in Jersey County, Illinois, built in 1954. It carries a Low hazard potential classification.
Dam profile
NID height · 31 ft31 ft tall and 360 ft long, taller than 72% 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 Hooper Lake Dam
The primary purpose of Hooper Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Lizzy Hooper (private). It impounds the Trib Rice Hollow near Portage De Sioux,mo.
The dam stands 31 feet tall and stretches 360 feet across, and has a maximum storage capacity of 36 acre-feet. Completed in 1954, 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 08/20/2025.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Illinois |
| County | Jersey |
| Nearest City | Portage De Sioux,mo |
| River/Stream | Trib Rice Hollow |
| Coordinates | 38.98881, -90.40851 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 31 ft |
| Dam Height | 31 ft |
| Dam Length | 360 ft |
| Year Completed | 1954 (72 years old) |
Storage & Hydraulics
| NID Storage | 36 acre-ft |
| Max Storage | 36 acre-ft |
| Normal Storage | 30 acre-ft |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Lizzy Hooper |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 08/20/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL00670 |
| Federal ID | IL00670 |
| More Info | State Dam Safety Program |