 In the 1960s and early 1970s Arrow had a monopoly on the log flume business, producing over 50 flumes by 1979.In 1976, the French company Reverchon Industries started building flumes and in 1979 Hopkins Rides entered the flume building business.Other manufacturers eventually followed with Intamin building its first log flume in 1986 and Mack Rides in 1987.