1973 Map of House Mountain

About this map

Anderson Ranch Reservoir defines the southern reach of this landscape, where the South Fork Boise River was impounded to create a massive high-country basin. The terrain is marked by significant elevation changes, rising from the water's edge toward the peaks of House Mountain and Granite Mountain within the Boise National Forest. The 1970s survey captures a wilderness infrastructure of trails and jeep trails connecting remote water sources like Daveys Spring and Ice Springs. Mapping by the U.S. Bureau of Reclamation provides detailed underwater contours for the reservoir, reflecting its mid-century development. While much of the area remains undeveloped forest, the margins of the Camas Prairie and Wilson Flat show the transition from steep mountain slopes to the more level plateaus that historically supported local grazing and transit. Smaller drainages, including Evans Creek and Myrtle Creek, illustrate the complex watershed feeding into the reservoir system.