
The Shasta River and Little Shasta River converge in this volcanic basin of Siskiyou County, where the 1954 landscape is defined by extensive lava flows and agricultural water management. The newly named Lake Shastina (formerly Dwinnell Reservoir) dominates the southern portion of the sheet, showing blue hatching to indicate controlled inundation areas. Settlement is concentrated in small rural pockets like Little Shasta and Big Springs, which serve the surrounding ranching and timber interests.
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