2015 Map of Duncan Peak

About this map

Duncan Peak anchors this high-elevation landscape within the Tahoe National Forest, where steep canyons and narrow ridges define the watershed of the North Fork American River. The map documents a complex network of historic water management features, including the China Wall-Iowa Hill Ditch, Iowa Hill Ditch, and Trap Line Ditch, reflecting the region's enduring mining and hydraulic infrastructure. These ditches contour across the slopes of the Forest Hill Divide, connecting disparate drainages such as Tadpole Creek and Harvey Gray Creek. Small settlements and high-country outposts like Robinsons Flat, Sailor Flat, and Mumford Bar are connected by rugged corridors such as Foresthill Road and Sawtooth Ridge Road. Topographical landmarks like Union Tunnel, American Hill, and the Barney Cavanah Ridge provide specific points of interest for those tracing the history of land use and resource extraction in Placer County.