
The Walla Walla Valley serves as a lush corridor where the Touchet River and Walla Walla River converge, supporting an intricate network of irrigation infrastructure. Settlement is concentrated around Touchet and Gardena, where local commerce is historically tied to the surrounding agricultural landscape. The presence of the Po in Touchet underscores the community's role as a local hub. The valley's water management is remarkably detailed, featuring the Touchet West Side Ditch, Touchet East Side Ditch, Gardena Ditch, and South Ditch, which channel water across the floor of the valley.
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