
The industrial and ranching legacy of eastern Contra Costa County is evident in this mid-century survey, which documents the transition of the northern foothills of Mount Diablo. The map identifies several significant former mining settlements, including Somersville, Stewartville, and West Hartley, alongside remnants of their operations such as Coal Mine Tunnels. The northern edge shows the expansion of Antioch south of the Southern Pacific tracks, while the interior valleys remain largely agricultural. Key infrastructure of the era, such as the Mokelumne River Canal, Siphon systems, and the Antioch Airport, underscores the region's development. Local social history is grounded in labels for the County Jail Farm, Sunshine Camp, and the Morgan Territory Sch, reflecting a landscape of isolated rural outposts and early recreation spots like Marsh Creek Springs.
49 named features on this map. Tap any name to fly to it.
Don’t see what you’re looking for? This feature index may not catch every label — zoom into the map to look around manually.
9 editions found
1896 · Mt. Diablo
USGS Topo · 1:62,500
1898 · Mt. Diablo
USGS Topo · 1:62,500
1907 · Antioch
USGS Topo · 1:62,500
1908 · Antioch
USGS Topo · 1:62,500
1910 · Jersey
USGS Topo · 1:31,680
1911 · Byron Hot Springs
USGS Topo · 1:31,680
1914 · Brentwood
USGS Topo · 1:31,680
1916 · Lone Tree Valley
USGS Topo · 1:31,680
1916 · Byron Hot Springs
USGS Topo · 1:31,680
1916 · Byron
USGS Topo · 1:62,500