 I @-@ 80 enters Iowa on a bridge over the Missouri River , where it leaves Omaha , Nebraska , to enter Council Bluffs . Almost immediately after landing on the Iowa side of the bridge , it meets I @-@ 29 at a Y interchange . From eastbound I @-@ 80 , northbound I @-@ 29 is accessed via a left exit . The two interstates travel together through southern Council Bluffs for three miles ( 5 km ) . The speed limit through this section is 55 miles per hour ( 90 km / h ) . The South 24th Street interchange serves a commercial area anchored by the Mid @-@ America Center and Horseshoe Casino . The South Expressway exit , which marks the southern end of Iowa Highway 192 ( Iowa 192 ) , is adjacent to a big box store commercial center . I @-@ 29 and I @-@ 80 diverge at another Y interchange ; I @-@ 29 heads south and I @-@ 80 heads to the northeast . 
