Havasu National Wildlife Refuge protects a rare corridor of water and wetland habitat along the lower Colorado River in California and Arizona, extending from Needles to Lake Havasu City. It includes thirty miles of river, about three hundred miles of shoreline, the relatively natural Topock Gorge, and Topock Marsh, a major birding area in the Lower Colorado River Valley. Its varied habitats support desert bighorn sheep, peregrine falcons, coyotes, bobcats, cougars, greater roadrunners, and sensitive species including the endangered southwestern willow flycatcher and threatened Yuma Ridgway’s rail. The refuge also draws heavy recreation use and receives support from visitor services and nonprofit volunteer efforts.