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Boundary Dam
Eggshell face of Boundary Dam (3942410819).jpg
Boundary Dam is located in Washington (state)
Boundary Dam
Location of Boundary Dam in Washington
Country United States
Location Pend Oreille County, Washington
Coordinates 48°59′14″N 117°20′51″W / 48.98722°N 117.34750°W / 48.98722; -117.34750
Status Operational
Opening date 1967
Owner(s) City of Seattle
Dam and spillways
Type of dam Arch-gravity
Impounds Pend Oreille River
Height 340 ft (100 m)
Length 740 ft (230 m)
Total capacity 95,000 acre⋅ft (117,000,000 m3)
Catchment area 25,200 sq mi (65,000 km2)
Surface area 1,668 acres (6.75 km2)
Power station
Installed capacity 1,003.25 MW
Annual generation 3,587 GWh

Boundary Dam is a concrete arch gravity-type hydroelectric dam, finished in 1967, on the Pend Oreille River, in the U.S. state of Washington. The dam is located in the northeast corner of Washington state. It is operated by Seattle City Light and makes up a significant portion of the City of Seattle's energy portfolio. On average, it provides upwards of 46% of the power generated by Seattle City Light. Boundary Powerhouse, located adjacent to the dam, is completely built inside of the rock that makes up the left abutment of the dam itself. It has a nameplate capacity of just over 1 gigawatt of generation. The component of the hydroelectric project were listed on the National Register of Historic Places in 2018.

A portion of the Kevin Costner film The Postman was filmed on the front of the dam. For a period of time in 1997, the dam's face had a facade of a town (Bridge City in the film).

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