2011 Map of May Lake

About this map

South Warner Rim towers over the eastern edge of the Warner Valley, defining the high-desert landscape of this corner of Lake County. Water management is the primary narrative of this arid region, where an extensive network of human-made catchments like Cork Reservoir Number Seven, Hahilly Reservoir Number Four, and Six Pack Reservoir Number Four collect seasonal runoff. These features, along with names like Cattle Guard Spring and Surveyor Spring, reflect a long history of range management and livestock grazing. Twentymile Creek and Horse Creek wind through the valley floor, feeding into larger storage sites such as Greaser Reservoir. The map illustrates how essential water security remains in this isolated environment, where small pools like May Lake and isolated springs are critical landmarks.