The Bonneville Power Administration (BPA) finished construction of the Bonneville Dam on the Columbia River and installed many miles of transmission lines throughout the Northwest.
![600 Bonneville Dam 1940_credit BPA](http://www.opalco.com/wp-content/uploads/1938/01/600-Bonneville-Dam-1940_credit-BPA-550x196.jpg)
The Bonneville Dam, 1940. Photo courtesy of the Bonneville Power Administration.