Loading map...

1972 Map of Otay Mountain

Name: 1972 Topographic Map of Otay Mountain
Creator: U.S. Geological Survey
Published: 1974
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1974

About this map

The San Ysidro Mountains define this international border landscape in the early 1970s, where steep ridgelines and deep canyons meet the United States Mexico boundary. The map documents the high-elevation terrain of Otay Mountain, a site of critical communication infrastructure as evidenced by multiple Radio Towers and the Otay Mountain Truck Trail. At Doghouse Junction, these specialized access roads converge, providing a look at the technical and defensive management of the high ground overlooking the Tijuana River.

In the eastern drainage, the local economy and settlement patterns are anchored by water and mining. The area around Donohoe Mtn reveals historical extraction at the Donohoe Mine, supported by vital water sources like Lupe Spring and Donohoe Spring. Small-scale social hubs such as the Dulzura Community Center and the remote Marron Valley indicate a sparse but established rural population along the San Diego Co line.