
The Middle Fork Feather River carves through this Plumas County landscape, following the path of the Western Pacific railroad through Mohawk Valley. This 1972 field-checked record reveals a region transitioning from its hard-rock mining roots to a recreational destination. The historic core of Johnsville serves as a gateway to Plumas Eureka State Park, where the industrial history of the Sierra Nevada is preserved in the Mammoth Mill (Ruins), the Mammoth Tunnel, and the Plumas Eureka Mill (Tunnel). Evidence of earlier timber and mining operations is scattered across the terrain, from the Knickrem Mill (Site) on Squirrel Creek to the Squirrel Creek Mine. Small settlements like Sloat, Cromberg, and Graeagle dot the rail line and valley floor, while the Feather River Prep Sch and nearby golf courses reflect the mid-century growth of seasonal tourism and residential development.
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