Waterloo Reservoir 1 Dam is an earth dam located in Monroe County, Illinois, built in 1924. It carries a Significant hazard potential classification.
Dam profile
NID height · 31 ft31 ft tall and 350 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 Waterloo Reservoir 1 Dam
The primary purpose of Waterloo Reservoir 1 Dam is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by City of Waterloo (private). It impounds the Trib Fountain Creek near Waterloo-offstream.
The dam stands 31 feet tall and stretches 350 feet across, creates a reservoir covering 7 acres, has a maximum storage capacity of 86 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1924, the structure is over a century 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 04/08/2022.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Illinois |
| County | Monroe |
| Nearest City | Waterloo-offstream |
| River/Stream | Trib Fountain Creek |
| Coordinates | 38.31647, -90.16773 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 31 ft |
| Dam Height | 31 ft |
| Dam Length | 350 ft |
| Year Completed | 1924 (102 years old) |
Storage & Hydraulics
| NID Storage | 86 acre-ft |
| Max Storage | 86 acre-ft |
| Normal Storage | 62 acre-ft |
| Surface Area | 7 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 845 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | City of Waterloo |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 04/08/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | IL00267 |
| Federal ID | IL00267 |
| More Info | State Dam Safety Program |