Download FREE Humbug Valley (CA) USGS topo maps. These are full-sheet 7.5 Minute (1:24,000 scale) topographic maps. The red outline on the map below identifies the boundaries of the Humbug Valley topo map.
Humbug Valley topo maps are provided as PDF files contained in ZIP files.
Note: The most current map is the 2015 Humbug Valley topographic map.