Length in Iowa: 57 miles/92 kilometers
Northern terminus: US 52/IA 64 near Sabula
Southern terminus: Illinois
state line (Mississippi River) at Davenport
Counties: Jackson, Clinton, Scott
Cities along route: Clinton, Camanche, Princeton, Le Claire,
Riverdale, Bettendorf, Davenport
NHS: From I-74 in Bettendorf to the Illinois state line
Freeway segments: None
Expressway segments: None
½ mile with IA 64 west of Sabula
¾ mile with IA 136 in Clinton
3½ miles with US 30 in Clinton
½ mile with IA 461 (Business US 61), between Brown and Brady Streets in Davenport
Designated: February 15, 1935 (approved November 20, 1934), along part of the former US 55 between Dubuque and Davenport, following the Mississippi River. This included a duplex of US 52 and 67 between Dubuque to Sabula.
Paving history: At the time of designation, the segment between IA 136 in Clinton and Davenport was paved.
1934: Paved from Almont (a town north of Clinton that no longer appears on the state highway map) to IA 136
1937: Paved from Bellevue northward to a point between St. Donatus and Bellevue
1941: Paved from the split with US 52 to Almont
1946: Paved from the Dubuque/Jackson county line to a point between St. Donatus and Bellevue
1947: Paved from the split with US 61 to the Dubuque/Jackson county line
1954: Paved from Bellevue to Green Island
1955: Last segment, between Green Island and the split with US 52, was paved
Major alignment changes:
July 12, 1940: Centennial Bridge across the Mississippi (between Davenport and
Rock Island, IL, opens); tolls were collected until May 2, 2003.
June 30, 1959: Realigned on a new road closer to the Mississippi River between Riverdale and
Le Claire, with the old hilltop segment becoming IA 417 in 1960.
January 24, 1968: Route truncated north of Sabula, eliminating the duplex with
US 52 and removing the highway from Dubuque County.
June 17, 1982: 3-mile bypass of Camanche opens
For other alignment changes in Davenport and Bettendorf that are not listed here, see the Highways of Davenport and Bettendorf page.