1981 Map of Point Arena

About this map

The San Andreas Rift Zone dictates the dramatic geography of this coastline, running parallel to the shore from Arena Cove south past the Gualala River. In the early 1980s, the landscape is defined by the proximity of the Pacific Ocean to the high ridges of the Coast Range, including Signal Ridge and Buck Ridge. The map documents a significant engineering change in the interior with the presence of the Warm Springs Dam and the resulting Lake Sonoma, altering the local hydrology near the Russian River basin.