1986 Map of Mumbo Basin

About this map

Trinity Mountains peaks and the high-elevation terrain of Shasta National Forest define this 1980s landscape along the border of Trinity and Siskiyou counties. The sheet captures a rugged wilderness characterized by deep canyons and glacial basins, notably the Mumbo Basin and the distinctively named The Bedstead. Resource extraction remains a visible part of the area's history, marked by the presence of the Altoona Mine and Integral Mine near the headwaters of the West Fork Trinity River. High alpine water bodies including Picayune Lake, Gumboot Lake, and Upper Mumbo Lake are scattered across the ridges, linked by primitive routes like the Picayune Trail. The map documents the complex drainage system where Ramshorn Creek and Mumbo Creek carve through the steep topography of Sherer Ridge and Blue Divide.