city, Mohave county, western Arizona, U.S., in the Chemhuevi Valley along the Colorado River, west of the Mohave Mountains. A planned community, Lake Havasu City was founded in 1964 and promoted by the industrialist Robert P. McCulloch as the focal point of a recreational and retirement development. It soon became the county's largest community. It centres on the 45-mile- (72-km-) long Lake Havasu. One of the focal points of tourism, the lake is impounded by Parker Dam and is 3 miles (4.8 km) across at its widest point. Many visitors are drawn to the region by the presence of the historic London Bridge, which was purchased by McCulloch for a sum of $2.5 million. Designed by John Rennie (Rennie, John) with multiple masonry arches and completed in 1831 over the River Thames in London, the bridge (which is not the London Bridge of the nursery rhyme) was transplanted stone by stone and re-erected to span a man-made inlet on the Colorado River. It was dedicated in 1971, and a replica of an English village was built near it. Havasu National Wildlife Refuge is to the north, and Lake Havasu State Park is across the lake in San Bernardino county, California. In addition to tourism and services, manufacturing is a major source of employment. Inc. 1978. Pop. (1990) 24,363; (2000) 41,938.