Blandinsville City Reservoir Dam is an earth dam located in McDonough County, Illinois, built in 1940. It carries a High hazard potential classification.
Dam profile
NID height · 20 ft20 ft tall and 2,680 ft long. 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 Blandinsville City Reservoir Dam
The primary purpose of Blandinsville City Reservoir 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 Blandinsville (local government). It impounds the Little Creek-offstream near Blandinsville.
The dam stands 20 feet tall and stretches 2,680 feet across, creates a reservoir covering 8 acres, and has a maximum storage capacity of 126 acre-feet. Completed in 1940, the structure is well-established, with more than 75 years of service.
This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. An emergency action plan is in place for this dam. The most recent inspection on record was 10/29/2024.
Living Downstream
If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The Illinois dam safety program can provide more specific information about emergency planning for this structure.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Illinois |
| County | McDonough |
| Nearest City | Blandinsville |
| River/Stream | Little Creek-offstream |
| Coordinates | 40.56051, -90.87476 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Dam Length | 2,680 ft |
| Year Completed | 1940 (86 years old) |
Storage & Hydraulics
| NID Storage | 126 acre-ft |
| Max Storage | 126 acre-ft |
| Normal Storage | 75 acre-ft |
| Surface Area | 8 acres |
| Spillway Type | None |
Ownership & Safety
| Purpose | Water Supply |
| Owner | City of Blandinsville |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Not assessed |
| Last Inspection | 10/29/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | IL00275 |
| Federal ID | IL00275 |
| More Info | State Dam Safety Program |