Cyril Johnson Mill Dam
Cyril Johnson Mill Dam is a masonry dam located in Tolland County, Connecticut. It carries a Significant hazard potential classification.
About Cyril Johnson Mill Dam
The primary purpose of Cyril Johnson Mill 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 American Woolen Co., Inc (private). It impounds the Furnace Brook.
The dam stands 15 feet tall and stretches 232 feet across, creates a reservoir covering 3 acres, and collects water from a drainage area of 16 square miles.
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.
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Location
| State | Connecticut |
| County | Tolland |
| River/Stream | Furnace Brook |
| Coordinates | 41.95559, -72.30150 |
Physical Characteristics
| Dam Type | Masonry |
| NID Height | 15 ft |
| Dam Height | 15 ft |
| Dam Length | 232 ft |
Storage & Hydraulics
| Surface Area | 3 acres |
| Drainage Area | 16 sq mi |
Ownership & Safety
| Purpose | Water Supply |
| Owner | American Woolen Co., Inc |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not Rated |
| Emergency Action Plan | No |
Identifiers
| NID ID | CT01308 |
| Federal ID | CT01308 |
| More Info | State Dam Safety Program |