2018 Map of North Yolla Bolly Mountains

About this map

Trinity National Forest and Mendocino National Forest converge in this high-elevation wilderness along the border of Trinity and Tehama counties. The terrain is defined by the North Yolla Bolly Mountains, where several major water systems originate, including the S Fork Trinity River and the S Fork Cottonwood Cr. The landscape is a complex network of deep basins like Pettijohn Basin and sharp ridgelines such as Dead Horse Ridge and Opium Glade Ridge. Historically significant points of interest include Chicago Camp and various water sources such as North Yolla Bolly Spring and Clarence Spring. The presence of several mountain passes, including Tedoc Gap and Rat Trap Gap, suggests the traditional routes used to traverse these peaks before modern forestry roads like Forest Rte 35 were established.