Little Sister Lake Dam is an earth dam located in Fulton County, Illinois, built in 1965. It carries a Low hazard potential classification.
Dam profile
NID height · 38 ft38 ft tall and 380 ft long, taller than 84% 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 Little Sister Lake Dam
The primary purpose of Little Sister Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Metropolitan Water Reclamation District (public utility). It impounds the Little Sister Creek near Maple Mills.
The dam stands 38 feet tall and stretches 380 feet across, creates a reservoir covering 36 acres, and has a maximum storage capacity of 221 acre-feet. Completed in 1965, 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 10/28/2022.
At 38 feet, this dam is taller than 84% of dams nationwide.
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Location
| State | Illinois |
| County | Fulton |
| Nearest City | Maple Mills |
| River/Stream | Little Sister Creek |
| Coordinates | 40.46052, -90.05884 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 38 ft |
| Dam Height | 38 ft |
| Dam Length | 380 ft |
| Year Completed | 1965 (61 years old) |
Storage & Hydraulics
| NID Storage | 221 acre-ft |
| Max Storage | 221 acre-ft |
| Normal Storage | 111 acre-ft |
| Surface Area | 36 acres |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Metropolitan Water Reclamation District |
| Owner Type | Public Utility |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 10/28/2022 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL01175 |
| Federal ID | IL01175 |
| More Info | State Dam Safety Program |