Pend Oreille
County
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Boundary Project
dam facts
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Height and thickness:
Boundary is a
thin-arch dam 740 feet long, rising 340
feet from its bedrock. Although 32 feet
thick at its base, the dam is only eight
feet thick at its crest.
Cost to build:
$94 million in 1967
Horsepower of turbines:
Smaller units up to 208,000
Larger units up to 268,000
Length of reservoir:
17.5 miles,
extending through mountain forests and
the towns of Metaline Falls and Metaline
to the base of Box Canyon Dam
Generating capacity:
1,050 megawatts at peak, up to 50 percent or more of the electricity used by Seattle City Light’s customers.
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Security Note: With heightened security concerns, access may be limited. Photo ID is required for all adults and some areas of the project are restricted.
For additional information, please send email to Gary Baird at gary.baird@seattle.gov or call (509) 446-3083.
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