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The Iowa Department of Transportation is responsible for the day-to-day maintenance of the primary highway system, which consists of Interstate Highways, United States Highways, and Iowa state highways. Currently, the longest primary highway is U.S. Highway 30 at 332 miles (534 km). The shortest highway is Interstate 129 at 0.27 miles (430 m).
Originally a spur route west to Thurman; extended west in 1980; now County Road J24 Iowa 146: 42.735: 68.775 US 63 / Iowa 102 in New Sharon: US 30 in Le Grand: 1926: current Iowa 147: 6.706: 10.792 Rockford: Iowa 14 in Floyd County: 1926: 2003 Spur route, former Iowa 53; now County Road B45 Iowa 148: 66.828: 107.549
Interstate 80 ( I-80) is a transcontinental Interstate Highway in the United States, stretching from San Francisco, California, to Teaneck, New Jersey. In Iowa, the highway travels west to east through the center of the state. It enters the state at the Missouri River in Council Bluffs and heads east through the southern Iowa drift plain.
U.S. Highway 20 ( US 20) in Iowa is a major east–west artery which runs across the state, separating the northern third of Iowa from the southern two-thirds. It enters Iowa from Nebraska, concurrent with Interstate 129 (I-129) and US 75, crossing the Missouri River at Sioux City. US 20 runs in a more-or-less straight line across Iowa ...
U.S. Highway 30 ( US 30) is a major east–west U.S. Highway which spans 330 miles (530 km) across the state of Iowa. It is the longest primary highway in the state and is maintained by the Iowa Department of Transportation (Iowa DOT). The route in Iowa begins at the Missouri River crossing at Blair, Nebraska, and ends at the Mississippi River ...
Auxiliary Interstates. I‑235 crossing the Des Moines River in Des Moines, Iowa. The Edna M. Griffin Memorial Bridge carrying I‑235 across the Des Moines River. The I‑480 bridge over the Missouri River between Council Bluffs, Iowa and Downtown Omaha, Nebraska. I‑280 crosses the Mississippi River over the Baker Bridge.
Iowa Highway 3. 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 (520 km) long. Iowa 3 begins at the South Dakota state line where it continues as South Dakota Highway 50 and ends at the Northwest Arterial at the Dubuque city limits.
The geography of Iowa includes the study of bedrock, landforms, rivers, geology, paleontology and urbanisation of the U.S. state of Iowa. The state covers an area of 56,272.81 sq mi (145,746 km 2 ).