Natural Dam P-2851

General information

Waterway  Oswegatchie River
Current status   Active license 
Type of facility Conventional Hydro
Mode of hydropower generation Run-of-river
Type of permit FERC License

FERC information

FERC docket # P-2851
FERC project name Natural Dam
Permit issued 9/1/11
Permit expiration 4/27/52

Ownership and operation

Owner type Industrial
Year first online (conventional hydro) 1959
Transmission or distribution system owner Niagara Mohawk Power Corp.

Power and generating capacity

Number of units 3
Total capacity from hydraulic turbine-generator units within each plant 1.0 mW
Average annual net hydropower generation 5,823.1 mWH

The Natural Dam Project consists of: a 230-foot-long, 3-foot-high concrete dam with a 155-foot-long spillway equipped with a 2.2-foot-high inflatable rubber dam and a 180-foot-long auxiliary dam/spillway; a 570-acre impoundment with a normal water surface elevation of 396.0 National Geodetic Vertical Datum (NGVD) ; a 152-foot-long headpond connected to a wooden power flume; a powerhouse containing three turbines directly connected to two 300-kW and one 420-kW generating units for a total installed capacity of 1,020 kW; a tailrace; and an 80-foot-long, 23-kilovolt transmission line.

The project creates a 570-foot-long bypassed reach. There are no recreational facilities at the project.

Source: FERC


Revised Study Plan Submitted 01-22-2008
Settlement Filed 03-04-2010

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