Pike Place Market, Seattle in 1978.

The City of Seattle and Interstate Highway 5, with Elliott Bay at right, seen in June of 1973. (Doug Wilson/NARA)

Children play in the yard of a Ruston, Washington home, while a Tacoma Smelter stack showers the area with arsenic and lead residue, August, 1972. (Gene Daniels/NARA)

Pumpkin vendor at Pike Place Market, Seattle, Washington 1978.

Left: Demolition and clearing in downtown Spokane, Washington, one year before opening day of Expo '74, May 1973. Right: The Lake Washington Ship Canal system, Seattle, Washington, at sunset, in March of 1973. In the foreground, the Evergreen Point Floating Bridge crosses Lake Washington, at center is the channel joining Lake Washington, Lake Union, and Puget Sound (background). (David Falconer/Doug Wilson/NARA)

The town of Cathlamet, Washington, on the Columbia River, boasted a population of 656 in May 1973. Today the population is listed as 534. (David Falconer/NARA)

Weyerhauser paper mills and Reynolds Metal Plant are both located in Longview, Washington, on the Columbia River, April 1973. (David Falconer/NARA)

Waiting for the Bainbridge Island ferry in September 1974.

Fishing craft crowd the Columbia River between Vancouver, Washington, and the Dalles, Oregon. In the background is Mt. Hood, May 1973. (David Falconer/NARA)

Mount Rainer and Tacoma's industrial waterfront, in Washington State, in April of 1973. (Doug Wilson/NARA)

Port of Seattle freight handling equipment and city skyline, an industrial waste barge under tow to landfill on the Snohomish River estuary. (Doug Wilson/NARA)

The Kingdome in 1975.

Pike Place Market in 1978.

Tacoma, July 1974.

Cathlamet in 1973, by the Columbia River.

The train schedule at the Wenatchee Depot Station on June 26, 1974.

Highway 2 in 1974, with the Cascade mountains in the distance.