Clear Lake National Wildlife Refuge is a National Wildlife Refuge of the United States in northeastern California. It includes about 20,000 acres of open water surrounded by over 26,000 acres of upland bunchgrass, low sagebrush, and juniper habitat. small, rocky islands in the wetlands provide breeding sites for American white pelicans, double-crested cormorants, and other colony-nesting birds. The uplands are inhabited by pronghorn, mule deer, and sage grouse.