High Falls Dam at Copenhagen is a concrete dam located in Lewis County, New York, built in 1909. It carries a Significant hazard potential classification.
Dam profile
NID height · 25 ft25 ft tall and 175 ft long, taller than 50% of U.S. dams with a recorded height. 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 High Falls Dam at Copenhagen
The primary purpose of High Falls Dam at Copenhagen is hydroelectric. The dam generates hydroelectric power by channeling water through turbines, converting the energy of flowing water into electricity. The dam is owned by Central Rivers Power, LLC (private). It impounds the Deer River near Deer River.
The dam stands 25 feet tall and stretches 175 feet across, creates a reservoir covering 4 acres, has a maximum storage capacity of 33 acre-feet, and collects water from a drainage area of 192 square miles. Completed in 1909, the structure is over a century 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 07/14/2008. That was over 18 years ago.
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Location
| State | New York |
| County | Lewis |
| Nearest City | Deer River |
| River/Stream | Deer River |
| Coordinates | 43.89722, -75.66417 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 25 ft |
| Dam Height | 25 ft |
| Dam Length | 175 ft |
| Year Completed | 1909 (117 years old) |
Storage & Hydraulics
| NID Storage | 33 acre-ft |
| Max Storage | 33 acre-ft |
| Normal Storage | 33 acre-ft |
| Surface Area | 4 acres |
| Drainage Area | 192 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | Central Rivers Power, LLC |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 07/14/2008 |
| Emergency Action Plan | No |
Identifiers
| NID ID | NY01345 |
| Federal ID | NY01345 |
| More Info | State Dam Safety Program |