Course of the Colorado River Topock Marsh in Topock Gorge and widens into Lake Havasu, formed by Parker Dam. Lake Havasu provides recreation as well as the home of the retired U.K. London Bridge in Lake Havasu City, Arizona, now the New London Bridge. Near Parker Dam are the first two major diversions of the lower Colorado: the Colorado River Aqueduct, which travels west to Los Angeles and San Diego, California; and the Central Arizona Project, which sends water east towards Phoenix and Tucson, Arizona. The intermittent Bill Williams River joins the Colorado from the east in Lake Havasu, just above Parker Dam. The river
Havasu Wilderness of trees grow in washes with willows and salt cedar found at the edges of the river. Havasu Wilderness is home to a variety of wildlife, including species of quail, geese, duck, grebe, crane, rail (including the endangered Yuma rail), heron, egret, falcon, eagle, desert bighorn sheep, coyote, porcupine, fox, and bobcat. Gila monster and the endangered desert tortoise can also be found in the wilderness. Fires, mechanized vehicles, some types of boats, and camping are not permitted in Havasu Wilderness. The most common activities are hiking and wildlife watching. Havasu Wilderness Havasu Wilderness is a wilderness area located within