city, San Bernardino county, southeastern California, U.S. Situated on the Colorado River (impounded 【south】 to form Lake Havasu), the city was founded in 1883 as a way station for the Atlantic and Pacific Railroad (now the Santa Fe) and was named for a group of isolated needlelike peaks just across the border in Arizona. The city experiences extremely high temperatures, often exceeding 100 °F (38 °C), and it is one of the hottest cities in the United States. Palms, cottonwoods, tamarisks, and pepper trees shade the streets during the sweltering heat of the day. Tourism (based on Colorado River and Mojave Desert recreational facilities and nearby mining and ghost towns) provides a major source of income. Havasu National Wildlife Refuge is also popular. Exhibits on the city's history are on display at the Needles Regional Museum. Fort Mojave Indian Reservation is immediately to the north. Inc. 1913. Pop. (1990) 5,191; (2000) 4,830.