2024 Map of Coleman Lake

About this map

Coleman Valley and the vast basin of Coleman Lake characterize this high-desert portion of Lake County. This modern digital survey shows the critical importance of water management in an arid landscape, where names like Greaser Reservoir and Cahill Reservoir suggest early 20th-century ranching infrastructure. Numerous family-named or descriptively-named water sources, such as Foskett Spring, Burro Spring, and Jackass Spring, dot the terrain, marking essential waypoints across the sagebrush-heavy valley. The mapping of Twentymile Slough and Greaser Lake in the north reveals the seasonal or intermittent nature of hydrology in the Warner Valley region. Connectivity is maintained primarily by Co HWY 3-15, which skirts the western edge of the lake bed, while the surrounding canyons like Greaser Canyon and Jones Canyon rise sharply from the basin floor.