1978 Map of Warm Springs Dam

About this map

Warm Springs Dam (Under Construction) is the defining feature of this 1978 survey, captured as the landscape was being reshaped to form Lake Sonoma. The map illustrates the transition from a network of canyon creeks to a major reservoir, with blue hatching indicating areas destined to be submerged. This change affected historic locations like Skaggs Springs (Hot) and various family-named landmarks such as Pritchett Peaks and Bummer Peak. To the south, the terrain rises toward The Cedars and Walbridge Ridge, where the rugged topography remains less altered by water management. A lone Schoolhouse and scattered Mine and Prospect labels hint at the earlier agricultural and extractive history of this portion of Sonoma County. Travel through these steep hills is marked by the winding Skaggs Springs Road and Rockpile Road, providing a detailed look at the region just before the reservoir reached its full extent.