Dupont, Washington

Our Operation

CalPortland’s DuPont operation sits on 335 acres 55 miles south of Seattle between Olympia and Tacoma. It is one of the largest producers of sand and gravel in the country and the primary source of construction aggregates for Puget Sound. Our state-of-the-art facility is a model of clean, efficient and environmentally conscious mining that meets or exceeds all environmental standards set by the U.S. Environmental Protection Agency and the Washington State Department of Ecology. Ninety-eight percent of material from the mine is used locally, from Everett to Olympia.

Every day, seven miles of automated conveyor belts move thousands of tons of material across the mine site, saving fuel and creating a safer, more efficient work environment. The quality is unsurpassed. Steilacoom gravels, the material at the DuPont mine, are the natural result of the glaciers that carved the Puget Sound thousands of years ago. The deposit is of such high quality that the state of Washington uses it as the standard when evaluating material for public projects.

The proximity to commercial waters allows 80 percent of material from DuPont to be shipped by barge. Each barge carries the equivalent of between 150 to 200 truck and trailer loads, reducing the number of vehicles on the road. Doing so also lowers the region’s carbon output and saves our citizens the economic cost of traffic accidents and congestion, construction crews, and taxes required to repair damaged roadways. Hidden from view, CalPortland’s DuPont operation is a silent contributor to the region’s growth in an industry that requires local products.