2024 Map of Calderwood Reservoir

About this map

Warner Valley's hydrology dominates this corner of Lake County, where seasonal waters and permanent basins shift across the desert floor. The northern reach is anchored by Crump Lake, while the eastern terrain rises sharply toward the rim overlooking Calderwood Reservoir and Fish Creek. This landscape is defined by the managed movement of water in an arid environment, seen in the strategically placed Greaser Reservoir and the drainage of Deep Creek. The presence of Twentymile Slough and Greaser Lake at the southern end suggests a basin where runoff collects against the high eastern ridges, creating a complex network of wetlands and intermittent flows that have long dictated land use in the high desert.