The Okanogan River flows south from northern Washington State, providing irrigation for thousands of acres of fruit trees and vineyards. In the photo below, you can see how the river widens and becomes part of the Columbia River system.
Now things get serious. Chief Joseph Dam, one of many dams on the Columbia, changes the flow and taps into the energy of this mighty river. Whether it is because of water licences or some other reason unknown to me, the orchards and vineyards suddenly become scarcer, and the land on the east side of the Columbia River is semi-arid desert. Cattle graze there, and a few small farms dot the landscape, but the great expanses of fertile land are no longer a part of the scenery as we drive eastward.
Note the arid land beyond the dam. It is a place for scrubby plants, coyotes, and rattlesnakes. No more lush orchards.
My advice – buy your bag of apples before you reach the confluence of the Okanogan and the Columbia.