1951 Map of Simi Valley East

About this map

Santa Susana and its surrounding ranchlands occupy the heart of this 1951 topographic study, updated in 1969 to show the rapid urban expansion of the era. The terrain is defined by the steep southern slopes of the Santa Susana Mountains and Oak Ridge, where deep incisions like Tapo Canyon and Las Llajas Canyon drain toward the Arroyo Simi. Local industry and land use are evidenced by the Tapo Gumbrand Mine and several large private holdings, including Tapo Ranch and Marr Ranch.