1990 Map of Hager Basin

About this map

Avanzino Ranch sits at the heart of this high-desert ranching landscape within the Modoc National Forest, illustrating the remote agricultural operations typical of the California-Modoc borderlands in the late 20th century. The terrain is defined by volcanic features and water management, where the prominent massif of Blue Mountain and its East Point overlook a network of seasonal drainages and man-made catchments like Avanzino Reservoir and Dry Valley Reservoir. The presence of numerous named water sources, including Boles Spring, Tramp Spring, and Blue Mountain Spring, indicates the critical importance of reliable water for livestock in the Hager Basin. This map captures a moment of managed wilderness, where natural peaks like Huffman Butte and Timbered Ridge coexist with the infrastructure of the range, including various tanks and creek systems such as Mosquito Creek and Fletcher Creek.