From desert bighorn sheep to the endangered southwestern willow flycatcher, birds and other animals at Havasu National Wildlife Refuge rely on the life-giving waters of the lower Colorado River. The refuge protects 30 river miles - 300 miles of shoreline - from Needles, California, to Lake Havasu City, Arizona. One of the last remaining natural stretches of the lower Colorado River flows through the 20-mile-long Topock Gorge. A great river in a dry, hot land attracts wildlife and people like a powerful magnet. Today, many thousands of visitors annually flock to the refuge to boat through the spectacular Topock Gorge, watch waterbirds in Topock Marsh, or hike to the Havasu Wilderness Area. Wildlife dwell in a precarious balance with the people who recreate here. Remember, we are guests in the home of lower Colorado River animals and plants.