Boundary Dam

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[4] 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.

Boundary Dam
Location of Boundary Dam in Washington (state)
Country	United States
Location	Pend Oreille County, Washington
Coordinates	48°59′14″N 117°20′51″W
Status	Operational
Opening date	1967[1]
Owner(s)	City of Seattle[1]
Dam and spillways
Type of dam	Arch-gravity
Impounds	Pend Oreille River
Height	340 ft (100 m)[1]
Length	740 ft (230 m)[1]
Reservoir
Total capacity	95,000 acre⋅ft (117,000,000 m^3)[1]
Catchment area	25,200 sq mi (65,000 km^2)[1]
Surface area	1,668 acres (6.75 km^2)[1]
Power Station
Installed capacity	1,003.25 MW[2]
Annual generation	3,587 GWh[3]

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).

See also

• List of dams in the Columbia River watershed

References

1. Boundary Dam Archived 2011-07-16 at the Wayback Machine, NPDP Dam Directory
2. https://www.seattle.gov/light/Boundary/
3. http://carma.org/plant/detail/5432
4. "Seattle City Light: Boundary Project".