1958 Map of Morgan Valley

About this map

Cache Creek winds through this 1958 survey, carving a path between the Swanson Range and Brophy Ridge. The terrain is defined by a series of parallel northwest-trending ridges, including the Blue Ridge and Cortina Ridge, which create isolated pockets of activity like Wilson Valley and Jericho Valley. The industrial character of the era is evident through numerous mining operations scattered across the slopes, such as the Reid Mine, Royal Mine, and the Manhattan Mine located near the Knoxville area. Notable family holdings and early settlements are marked by the Hennesey Ranch, Ink Ranch, and Kennedy Flats. In the southeast, the rugged topography drops toward Zim Zim Falls and Eticuera Creek, while the Rumsey Rancheria sits near the eastern boundary. This document captures the complex intersection of Lake, Napa, Colusa, and Yolo counties before modern development altered these traditional ranching and mining landscapes.