 At N @-@ 133 , I @-@ 680 turns to the east towards Iowa . South of this interchange , I @-@ 680 travels through residential neighborhoods , but to the east , the population thins and the interstate passes through farmland for 4 1 ⁄ 2 miles ( 7 @.@ 2 km ) . I @-@ 680 crosses over N @-@ 36 , which is accessed via the US 75 interchange 1 ⁄ 2 mile ( 0 @.@ 80 km ) later . US 75 runs adjacent to I @-@ 680 for one mile ( 1 @.@ 6 km ) before turning south at 30th Street . The interstate crosses the Missouri River to Iowa via the Mormon Bridge . 
