 In the U.S. state of Utah , U.S. Route 89 ( US @-@ 89 ) is a long north – south state highway spanning more than 502 miles ( 807 @.@ 891 km ) through the central part of the state . Between Provo and Brigham City , US @-@ 89 serves as a local road , paralleling ( and occasionally concurring with ) Interstate 15 , but the portions from Arizona north to Provo and Brigham City northeast to Wyoming serve separate corridors . The former provides access to several national parks and Arizona , and the latter connects I @-@ 15 with Logan , the state 's only Metropolitan Statistical Area not on the Interstate . 
