Interstate highways in Iowa
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Interstate 380
Length: 73 miles/117 kilometers
Northern terminus: The intersection of Mitchell Avenue and Washington Street (US 218) in Waterloo
Southern terminus: I-80 (exit #239) near Coralville
Terminus photos

Counties: Black Hawk, Buchanan, Benton, Linn, Johnson
Cities along route: Waterloo, Evansdale, Elk Run Heights, Raymond, Gilbertville, Brandon, Urbana, Center Point, Robins, Hiawatha, Cedar Rapids, Shueyville, North Liberty, Coralville

Exit lists: Entire route
  • 1½ miles with US 218 between the northern terminus and US 20 in Waterloo.
  • 71 miles with IA 27, between the US 20/218 interchange in Waterloo and the southern terminus at I-80; this includes a 6-mile triplex with US 20 east of Waterloo (between exits #65 and #71) and a 16-mile triplex with US 218 between US 30 (exit #16) and I-80 (exit #0).
  • History
  • September 19, 1973: First segment, from I-80 to the Cedar Rapids airport exit (#13), then IA 84, opened
  • December 16, 1975: Segment between 5th Avenue SW and 33rd Avenue SW in Cedar Rapids opened
  • June 25, 1976: Segment between 33rd Avenue SW in Cedar Rapids and the airport exit opened
  • June 11, 1979: Segment between 5th Avenue and 7th Street NE in Cedar Rapids opened
  • December 4, 1981: Segment between 7th Street NE and Glass Road/32nd Street NE in Cedar Rapids opened
  • November 17, 1982: Segment between Glass Road/32nd Street and Boyson Road in Hiawatha opened
  • August 9, 1984: Segment from Mitchell Avenue in Waterloo to the end of the US 20 multiplex opened
  • August 14, 1984: Segment from Hiawatha to IA 150 near Urbana opened
  • September 12, 1985: Last segment, between US 20 and IA 150, opened
  • Notes
  • Iowa's newest Interstate was a result of the 1968 expansion of the Interstate system; the I-380 number was approved by AASHTO on June 23, 1969. As was the case with I-35, a group of area farmers opposed the proposed diagonal routing. An alternate alignment following US 20 and IA 150 was rejected by transportation commissioners in 1972, as was one along an abandoned railroad line in 1976. (The railroad right-of-way became the Cedar Valley Nature Trail instead.) After three years of litigation, the 8th Circuit Court of Appeals in St. Louis gave the Iowa DOT the go-ahead to build it in a December 1979 ruling. Budget problems delayed its completion in the early 1980s, but I-380 was finally completed in 1985 to cut the travel time between Waterloo and Cedar Rapids by half an hour. This marked the end of 27 years of Interstate highway construction in Iowa.
  • I-380 was supposed to have gone all the way through downtown Waterloo into Cedar Falls, under an extension that had been approved in 1974, but the city of Waterloo decided to participate in the Interstate Substitution Program (which allowed for the transfer of Interstate funds into other projects in the area) instead. The Federal Highway Administration approved the substitution plan on November 25, 1981. The freeway north of downtown Waterloo, which was completed in 1992, was signed as US 218 instead; a six-lane at-grade boulevard connects this with I-380's northern terminus.

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