Army Colonel Franklin Matthias had his orders. He needed to find a site for the plutonium production facility of the Manhattan Project. Matthias found that site in the open country of eastern Washington. Why did Matthias think the site was so perfect? Explore that question as you visit parks, paddle the Columbia River, and hike a landscape of rolling hills and vast vistas. Scroll down to see all the exciting ways you explore the outdoors in the Tri-Cities.
Scroll down for outside activities that will help you explore the Manhattan Project ▼
Last updated: March 10, 2022