Chase Mill is a concrete dam located in Washington County, Maine, built in 1870. It carries a Low hazard potential classification.
Dam profile
NID height · 20 ft20 ft tall and 45 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 Chase Mill
The primary purpose of Chase Mill 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 East Machias (local government). It impounds the Chase Mill Stream.
The dam stands 20 feet tall and stretches 45 feet across, creates a reservoir covering 5,250 acres, has a maximum storage capacity of 32,900 acre-feet, and collects water from a drainage area of 53 square miles. Completed in 1870, the structure is one of the older dams in the region, with over a century and a half of service.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life.
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Location
| State | Maine |
| County | Washington |
| River/Stream | Chase Mill Stream |
| Coordinates | 44.75617, -67.36043 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Dam Length | 45 ft |
| Year Completed | 1870 (156 years old) |
Storage & Hydraulics
| NID Storage | 32,900 acre-ft |
| Max Storage | 32,900 acre-ft |
| Normal Storage | 27,500 acre-ft |
| Surface Area | 5,250 acres |
| Drainage Area | 53 sq mi |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | East Machias |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | ME00335 |
| Federal ID | ME00335 |
| More Info | State Dam Safety Program |