Us Army Corps of Engineers, Washington.
With a total of 27 generating units, Chief Joseph Dam is the second-largest hydropower producer in the United States -- second only to Grand Coulee Dam. The power plant produces enough power to supply the electrical needs of over 1.5 million people.
Chief Joseph Dam is located in Bridgeport, WA. From Grand Coulee, drive 22 miles west on WA 174 to WA 17. Drive 16 miles west on WA 17 to the Columbia River. Or from Wenatchee, WA, drive 73 miles north on US 97, then 8 miles east on WA 17.