The settlement of Las Vegas, Nevada was founded in 1905 before the opening of a railroad that linked Los Angeles and Salt Lake City. The stopover attracted some farmers to the area, and fresh water was irrigated to the settlement. In 1911, the town was incorporated as part of the newly founded Clark County. Urbanization took off in 1931 when work started on the Boulder Dam, bringing a huge influx of young male workers, for whom theaters and casinos were built, largely by the Mafia. Electricity from the dam also enabled the building of many new hotels along the Strip. The arrival of Howard Hughes in 1966 did much to offset mob influence and helped turn Las Vegas into more of a family tourist center.