The primary highway system makes up over 9,000 miles (14,000 km), approximately 8 percent of the U.S. state of Iowa's public road system. The Iowa Department...

major highways that were on the secondary system, which is made up of all rural roads not on the primary highway system. At the time, the Iowa Code provided...

the Iowa Department of Transportation and individual county boards of supervisors led to a mass transfer of jurisdiction of several state highways in Iowa...

State highways in the U.S. state of Iowa are owned and maintained by the Iowa Department of Transportation. 2012 Volume of Traffic on the Primary Road...

Iowa Highway 17 (Iowa 17) is a 103-mile-long (166 km) north–south state highway that traverses primarily rural areas in central and north-central Iowa...

Iowa Highway 141 (Iowa 141) is an east–west highway in the western and central portions of the state. It is the most direct link between Sioux City and...

president, making Iowa 1 one of the oldest routes in the state, pre-dating the current primary highway system by nearly eighty years. The highway was seriously...

which passes through Iowa's "Little Switzerland" region. The Iowa 150 designation has been a part of the primary highway system since its inception in...

Iowa Highway 92 (Iowa 92) is a state highway that runs from east to west across the state of Iowa. Iowa 92 is 279 miles (449 km) long and is part of a...

Iowa Highway 13 (Iowa 13) is a north–south highway in eastern Iowa. It has a length of 85+1⁄4 miles (137.2 km). The southern terminus of Iowa Highway...

Iowa Highway 163 (Iowa 163) is a state highway that travels from U.S. Highway 69 in Des Moines to US 63 near Oskaloosa. The Iowa Department of Transportation...

was removed from the primary highway system in 1968. Iowa 7 began at the cloverleaf interchange between I-29 and two U.S. Highways – US 20 and US 77 in...

spur route connecting What Cheer to Primary Road No. 2, it is an original route in the Iowa primary highway system. In the early 1930s, the route was extended...

Iowa Highway 965 (Iowa 965) is a very short state highway in Coralville, Iowa that connects U.S. Highway 6 (US 6) to Interstate 80 (I-80) as there is no...

Iowa Highway 146 is a state highway in central Iowa. It runs in a north–south orientation and is 43 miles (69 km) long. Iowa 146 begins at an intersection...

U.S. Highway 34 (US 34) is a United States Highway that runs across the southern third of Iowa. It begins on a bridge over the Missouri River west of...

Iowa Highway 3 (Iowa 3) is a state highway that runs from east to west across the state of Iowa. It is the longest state highway in Iowa, at 323 miles...

Iowa 9 southeast of Larchwood. The highway has been in the primary highway system since 1930, when it was known as Iowa 26. On January 1, 1969, Iowa 26...

Iowa Highway 60 (Iowa 60) is a north–south state highway in northwest Iowa. The highway runs at a southwest-to-northeast angle. The southern end of Iowa...

Iowa Highway 333 (Iowa 333) is a short highway in southwestern Iowa. It serves as a connector route between Interstate 29 (I-29) and U.S. Highway 275...

from the early and mid-1960s showed I-280 in Omaha. Since this highway would extend into Iowa and I-280 was already planned for the Quad Cities area, this...

Iowa Highway 212 is a state highway in Iowa County, Iowa. It runs 12 miles (19 km) from Iowa Highway 21 south of Belle Plaine to U.S. Highway 6 in Marengo...

Iowa Highway 2 (Iowa 2) is a 251-mile-long (404 km) state highway which runs across the southernmost tier of counties in the U.S. state of Iowa. At no...

Iowa Highway 90 (Iowa 90) was a state highway in central Iowa. The highway was in service to traffic from 1932 through 1981 and took several forms over...

U.S. Highway 6 (US 6) is an east–west United States Numbered Highway which runs 322 miles (518 km) across the U.S. state of Iowa. The route is signed...

through northern Iowa, Iowa 107's role in the primary highway system began to diminish. Portions of the route were removed from the system altogether. In...

Iowa Highway 925 (Iowa 925) was a state highway that was an alternative to Interstate 80 (I-80) between Adair and Dexter. It began at exit 75 along I-80...

Iowa Highway 99 (Iowa 99) was a state highway in southeastern Iowa. It began in downtown Burlington and generally followed the course of the Mississippi...

Iowa Highway 175 (Iowa 175) is a main east–west route in the northern portion of the state. The highway has a length of 221 miles (356 km). Iowa Highway...

Iowa Highway 412 (Iowa 412) was a state highway in Waterloo, Iowa. It began at U.S. Highway 63 (US 63) in southwestern Waterloo and traveled to the east...