2010 Map of Cowan Reservoir

About this map

Cowan Homestead and established ranching outposts define this high-desert landscape in Owyhee County, Idaho. The map reveals a sophisticated network of water management essential for livestock and settlement in the arid West, centered around the Diamond A Dam and the long, winding path of the Cowan Ditch. These man-made improvements work in concert with natural drainage systems like Cougar Creek and Dorsey Creek to sustain the local geography. Significant landforms such as Dorsey Table overlook the valley, providing natural landmarks for the Rutherford Ranch and Jones Ranch. This 2010 survey offers a detailed record of remote Idaho land use, showing how family names remain etched onto the map through homesteads and ranching properties that have persisted through the generations.