 At Gunnison , US @-@ 89 turns east before curving northeast into the Sanpete Valley , formed by the San Pitch River , a tributary of the Sevier River . Along US @-@ 89 in this valley are several small cities : Manti , Ephraim , Mount Pleasant , and Fairview . Between Ephraim and Mount Pleasant , US @-@ 89 meets the south end of SR @-@ 132 at Pigeon Hollow Junction . SR @-@ 132 was formerly US @-@ 189 , connecting US @-@ 89 with US @-@ 91 in Nephi . Beyond Fairview , where the scenic SR @-@ 31 turns east , US @-@ 89 climbs out of the valley , reaching a summit at Hill Top ( elevation 6400 feet / 2000 m ) . Thistle Creek parallels the next leg of the highway , descending through a canyon to the junction with US @-@ 6 near the ghost town of Thistle , flooded by a landslide in 1983 . Thistle Creek and Soldier Creek , paralleled by US @-@ 89 and US @-@ 6 , merge near this junction to form Spanish Fork , which the overlapped routes follow northwest through Spanish Fork Canyon into the Utah Valley at Moark Junction . US @-@ 89 splits to the north from US @-@ 6 there , skirts the west edge of Mapleton , and merges with SR @-@ 51 - the old Arrowhead Trail ( US @-@ 91 ) - south of downtown Springville . 
