I-280, I-480, and I-680

For an explanation of the route listings, click here.

	Interstate 280
	Length in Iowa: 9½ miles/15 kilometers Western terminus: I-80 (exit #290) in Davenport Eastern terminus: Illinois state line (Mississippi River) at Davenport; the route runs for an additional 18 miles in Illinois (sharing its last 6 with I-74). Entrance photos Counties: Scott Exit lists: Entire route
	History
	October 25, 1973: Entire route in Iowa, including the bridge into Illinois, opened. (However, the interchange from I-80 dates back from the 1960s; it connected I-80 with US 6 before then.) The route had been completed in Illinois by 1968.

	Interstate 480
	Length: Three-fourths of a mile/1.2 kilometers Western terminus: Nebraska state line (Missouri River) Eastern terminus: I-29 (exit #53B) in Council Bluffs Entrance photos Counties: Pottawattamie Exit lists: Entire route Multiplexes: With US 6 for its entire route
	History and Notes
	This whole segment opened on October 21, 1966; although it is not much to talk about in Iowa, it does run for an additional four miles through Omaha, NE (passing through the business district), before meeting with I-80. East of I-29 the road continues into Council Bluffs as US 6.

	Interstate 680
	Length in Iowa: 29 miles/47 kilometers Western terminus: Nebraska state line (Missouri River) north of Omaha, NE; it runs for an additional 12 miles in Nebraska along the western and northern edges of Omaha. Eastern terminus: I-80 (exit #27) near Neola Entrance photos Counties: Pottawattamie Exit lists: Entire route Multiplexes: 9½ miles with I-29, between exit #61 and exit #71 (exit numbers follow I-29) in Pottawattamie County.
	History
	1973: Replaced I-80N (creating the duplex with I-29 in between) 1977: Segment between the Nebraska state line and I-29 completed
	Notes
	The route around Omaha to I-29 was originally designated as I-280, and early-1960s maps mark the completed piece of the route in Nebraska as I-280. Problem was, there was another I-280 in the books in the Quad Cities area. Since AASHTO does not allow duplicate three-digit interstate route numbers in the same state, this route became I-680 in the mid-1960s. The bridge across the Missouri River actually predates I-680; it was an unnumbered extension of NE 36 into Iowa (see IA 988). Tolls were still collected on I-680 eastbound until April 21, 1979.