Techny Reservoir Dam is an earth dam located in Cook County, Illinois, built in 1979. It carries a Significant hazard potential classification.
Dam profile
NID height · 11 ft11 ft tall and 544 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 Techny Reservoir Dam
The primary purpose of Techny 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 Metropolitan Water Reclamation District (local government). It impounds the West Fork North Branch Chicago River near Glenview.
The dam stands 11 feet tall and stretches 544 feet across, and has a maximum storage capacity of 350 acre-feet. Completed in 1979, the structure is 47 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 06/07/2024.
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Location
| State | Illinois |
| County | Cook |
| Nearest City | Glenview |
| River/Stream | West Fork North Branch Chicago River |
| Coordinates | 42.10606, -87.81067 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 11 ft |
| Dam Height | 11 ft |
| Dam Length | 544 ft |
| Year Completed | 1979 (47 years old) |
Storage & Hydraulics
| NID Storage | 350 acre-ft |
| Max Storage | 350 acre-ft |
| Normal Storage | 100 acre-ft |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Metropolitan Water Reclamation District |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 06/07/2024 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL01228 |
| Federal ID | IL01228 |
| More Info | State Dam Safety Program |