Mill Dam
Mill Dam is a concrete dam located in St. Lawrence County, New York, built in 1916. It carries a Low hazard potential classification.
About Mill Dam
Mill Dam is a dam in St. Lawrence, New York. The dam is owned by Town Of Madrid (local government). It impounds the Grass River near Madrid.
The dam stands 12 feet tall and stretches 396 feet across, creates a reservoir covering 40 acres, has a maximum storage capacity of 291 acre-feet, and collects water from a drainage area of 587 square miles. Completed in 1916, the structure is over a century old.
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. An emergency action plan is in place for this dam. The most recent inspection on record was 07/17/2009. That was over 16 years ago.
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Location
| State | New York |
| County | St. Lawrence |
| Nearest City | Madrid |
| River/Stream | Grass River |
| Coordinates | 44.74667, -75.13167 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 12 ft |
| Dam Height | 12 ft |
| Dam Length | 396 ft |
| Year Completed | 1916 (110 years old) |
Storage & Hydraulics
| NID Storage | 291 acre-ft |
| Max Storage | 291 acre-ft |
| Normal Storage | 140 acre-ft |
| Surface Area | 40 acres |
| Drainage Area | 587 sq mi |
| Max Discharge | 7,200 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Other |
| Owner | TOWN OF MADRID |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not Rated |
| Last Inspection | 07/17/2009 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NY00819 |
| Federal ID | NY00819 |
| More Info | State Dam Safety Program |