sentences:  Junior-senior high school enrollment increased to over 600 (it had been less than half that previously), and a three-phase building program was started, with additions completed in 1967, 1971 and 1974.Junior high students were moved from the high school building to the new Blackhawk Junior High in LeClaire (now Pleasant Valley Junior High) in 1970.During the mid-1970s, a proposal to renovate and move high school students to Blackhawk Junior High and repurpose the high school building as a junior high, failed.