Hewittville
Key Takeaway
Hewittville is classified as low hazard in New York. It was completed in 1870 and is 156 years old. Its primary use is hydroelectric.
Physical Details
| Dam Height | 18 ft (taller than 49.5% in NY) |
| Dam Length | 615 ft |
| Dam Type | Concrete |
| Max Storage | 360 acre-ft |
| Normal Storage | 360 acre-ft |
| Surface Area | 109 acres |
| Drainage Area | 1,036 sq mi |
| Max Discharge | 11,500 cfs |
| Year Completed | 1870 (156 years old) |
| NID ID | NY00574 |
Safety Information
No probable loss of human life and low economic/environmental losses expected.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
Erie Boulevard Hydropower, L.P.
Private
Nearby Dams
Unionville
St. Lawrence, NY
Low Hazard 20 ftSissonville
St. Lawrence, NY
Low Hazard 16 ftNorwood
St. Lawrence, NY
High Hazard 24 ftPotsdam - East Dam
St. Lawrence, NY
Low Hazard 7 ftPotsdam - West Dam
St. Lawrence, NY
Low Hazard 11 ftYaleville
St. Lawrence, NY
Low Hazard 12 ftSugar Island
St. Lawrence, NY
Low Hazard 35 ftEast Norfolk
St. Lawrence, NY
High Hazard 16 ftFrequently Asked Questions
What is the hazard classification of Hewittville?
Hewittville is classified as Low Hazard. No probable loss of human life and low economic/environmental losses expected. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Hewittville?
Hewittville is owned by Erie Boulevard Hydropower, L.P. (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Hewittville built?
Hewittville was completed in 1870, making it 156 years old. Many U.S. dams were built between the 1930s and 1970s during a period of major infrastructure investment.
What is the primary purpose of Hewittville?
Hewittville serves the following purposes: Hydroelectric, Fire Protection, Stock, Or Small Fish Pond. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Hewittville?
Hewittville has a dam height of 18 ft. Dam height is measured from the natural streambed at the downstream toe to the top of the dam, and may differ from the visible height.
When was Hewittville last inspected?
Hewittville was last inspected on July 15, 2019. Inspection dates indicate when a formal review occurred, not the results of that inspection.