1948 Map of Challenge

About this map

Challenge and the surrounding Sharon Valley are the primary focus of this late 1940s landscape, which underwent significant updates in 1969 to reflect the expansion of the Bullards Bar Reservoir. This survey captures the transition of the Yuba River canyon, where purple photorevision marks indicate the new shoreline at Spillway Elevation 1902. The region’s deep ties to the Gold Country are evident in several extractive sites, including the Mother Lodes Mines, Red Cross Mine, and Horseshoe Mine. A patchwork of family-owned ranching history is preserved through labels like Indiana Ranch, Whitehead Ranch, and the Summit Hill Ranch. Higher elevations within the Plumas National Forest and Tahoe National Forest are monitored from the Pike County Pk Lookout and the Lookout Tower on Oregon Pk.