
Fresno and the fertile Central Valley serve as the western anchor of this 1955 survey, where an extensive irrigation and rail network supported a booming agricultural economy. The Southern Pacific RR and Atchison Topeka and Santa Fe Ry parallel U S Highway 99, linking established trade centers like Hanford, Visalia, and Tulare. To the south, the basin of Tulare Lake is shown during a period of significant hydrological modification. The landscape shifts dramatically eastward as the valley floor meets the high peaks of the Sierra Nevada. This survey documents the mid-century boundaries of Sequoia National Park and Kings Canyon National Park, including the massive granite heights of Mt Whitney and Mt Williamson along the Great Western Divide. In the foothills, the newly formed Pine Flat Reservoir on the Kings River reflects the era's massive water management projects.
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