Interstate 80 East - Grinnell to Coralville

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The first sign for Interstate 380, U.S. 217 and Iowa 27 (Avenue of the Saints) appears one mile west of the diamond interchange (Exit 237) with Ireland Avenue at Tiffin. Totaling 73.05 miles, I-380 joins Iowa City with Cedar Rapids and Waterloo to the north and west.
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Ireland Avenue stems north from 340th Street to cross Interstate 80 at Exit 237 and the city of Tiffin.
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Ireland Road extends north from Exit 237 to the Tiffin street grid at City Hall and U.S. 6 at Roberts Ferry Road.
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Interstate 80 expands to six lanes east from Exit 237 to the turbine interchange (Exit 239) with I-380, U.S. 218 and Iowa 27.
12/29/23

Exit 239 departs I-80 east 0.9 miles beyond the Ireland Avenue overpass for I-380 north and U.S. 218/Iowa 27. Major construction from 2017 to November 2023 replaced a cloverleaf interchange at Exit 239 with a systems exchange.
12/29/23

Iowa 27 forms a multi-state route with Missouri Route 27 along the Avenue of the Saints Corridor between the Twin Cities in Minnesota and St. Louis. U.S. 218 concludes a 318 mile route from Owatonna, Minnesota in southernmost Iowa at U.S. 136 in Keokuk.
12/29/23

Interstate 80 enters the city of Coralville at the I-380/U.S. 218-Iowa 27 overpass. Iowa City follows seven miles.
12/29/23

U.S. 218/Iowa 27 extend southeast from the end of I-380 another 14 miles along a freeway to Riverside. The pair continue south from Iowa 22 along an expressway to Mount Pleasant and their split at Donnellson.
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Interstate 380 leads north 20 miles to Downtown Cedar Rapids. U.S. 218 partitions with the freeway for U.S. 30 west along a stair stepped route north to rejoin I-380 at the U.S. 20 freeway in Waterloo.
12/29/23