National Historic Landmark-Bonneville Dam Historic District

Built in the 1930s by the Federal government to raise and divert the Columbia River to generate hydroelectric power, the dam represented a unique engineering challenge for a diversion/overflow dam; it was the first major structure built with a "hydraulic drop" capable of developing more than 500,000 KW of electric power.

Other structures in the district are the #1 Powerhouse, the Navigation Lock, the Fishways, and the Fish Hatchery.

Courtesy National Park Service National Historical Landmarks

Photo Courtesy Library of Congress Historic American Building Survey