Armstrong Park Flood Control Reservoir Dam
Armstrong Park Flood Control Reservoir Dam is an earth dam located in DuPage County, Illinois. It carries a High hazard potential classification.
About Armstrong Park Flood Control Reservoir Dam
The primary purpose of Armstrong Park Flood Control Reservoir Dam is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by Dupage County (local government). It impounds the Klein Creek - Offstream near Carol Stream.
The dam stands 22 feet tall, and has a maximum storage capacity of 114 acre-feet.
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 11/12/2025.
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 | DuPage |
| Nearest City | Carol Stream |
| River/Stream | Klein Creek - Offstream |
| Coordinates | 41.91681, -88.13429 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 22 ft |
| Dam Height | 22 ft |
Storage & Hydraulics
| NID Storage | 114 acre-ft |
| Max Storage | 114 acre-ft |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | DUPAGE COUNTY |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Not Available |
| Last Inspection | 11/12/2025 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | IL55159 |
| Federal ID | IL55159 |
| More Info | State Dam Safety Program |