1969 Map of Topo Valley

About this map

The San Andreas Rift Zone dominates the structural geography of this San Benito County landscape, carving a distinct corridor between Buck Ridge and the western canyons. This 1969 field survey illustrates a sparsely settled ranching region where remote outposts like Sanz Ranch and Tannehill Ranch are connected by seasonal water sources and dirt tracks. The terrain is characterized by a series of parallel valleys, including Little Rabbit Valley and Rabbit Valley, which follow the seismic fault line. Local infrastructure is minimal, represented by scattered Water Tanks, a Quarry near the San Benito River, and small aviation Landing Strips. The drainage pattern is complex, with Topo Creek and Bitterwater Creek navigating the deep incisions of Wildhorse Canyon and George Hansen Canyon.