Montgomery Dam is a gravity dam located in Kane County, Illinois, built in 1969. It carries a Significant hazard potential classification.
Dam profile
NID height · 7 ft7 ft tall and 325 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic concrete gravity section and the water level is illustrative.
About Montgomery Dam
The primary purpose of Montgomery 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 Illinois Department of Natural Resources (state). It impounds the Fox River near Montgomery.
The dam stands 7 feet tall and stretches 325 feet across, and has a maximum storage capacity of 131 acre-feet. Completed in 1969, the structure is well into its service life at over 50 years 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. The most recent inspection on record was 06/13/2024.
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Location
| State | Illinois |
| County | Kane |
| Nearest City | Montgomery |
| River/Stream | Fox River |
| Coordinates | 41.73372, -88.33392 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 7 ft |
| Dam Height | 7 ft |
| Dam Length | 325 ft |
| Year Completed | 1969 (57 years old) |
Storage & Hydraulics
| NID Storage | 131 acre-ft |
| Max Storage | 131 acre-ft |
| Normal Storage | 131 acre-ft |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Illinois Department of Natural Resources |
| Owner Type | State |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 06/13/2024 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL00920 |
| Federal ID | IL00920 |
| More Info | State Dam Safety Program |