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U.S. Highway 218 (US 218) is an original United States Highway that was created in 1926. Although technically a spur of US 18, US 218 neither begins nor ends at US 18, but overlaps US 18 for eight miles (13 km) near Charles City, Iowa. US 218 begins at U.S. 136 in downtown Keokuk and ends 319 miles (513 km) away at Interstate 35 (I-35) and US 14 at Owatonna, Minnesota. A large portion of US 218 in Iowa is part of the Avenue of the Saints, which connects St. Louis, Missouri, and Saint Paul, Minnesota.
Iowa Highway 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 point along its route is Iowa 2 more than 15 miles (24 km) from the Missouri state line, except for a small section near its eastern terminus. Iowa 2 stretches across the entire state; from the Missouri River near Nebraska City, Nebraska, to U.S. Highway 61 (US 61) at Fort Madison. Prior to becoming a primary highway, the route was known as the Waubonsie Trail.
Iowa Highway 15 is a north–south state highway in northern Iowa. It is 63+1⁄2 miles (102.2 km) long. The southern end of Iowa 15 is 7 miles (11 km) east of Pocahontas at an intersection with Iowa Highway 3. The northern end is at the Minnesota border, where the highway continues north as Minnesota State Highway 15 near Fairmont, Minnesota. Prior to 1969, the route was known as Iowa Highway 44; it was renumbered to match the highway in Minnesota.
Iowa Highway 38 is a 98-mile-long (158 km) state highway that runs through eastern Iowa. Iowa 38 begins at Iowa Highway 92 in Muscatine and ends at Iowa Highway 3 near Greeley.
Iowa Highway 1 (Iowa 1) is a state highway in the U.S. state of Iowa that extends from Keosauqua to Anamosa. It travels nearly 120 miles (190 km), mainly through rich farmland and small communities. Iowa 1 provides an important link to Iowa City and the University of Iowa as it passes through campus. Portions of the route today date back to the late 1830s, when Martin Van Buren was 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 damaged by the Cedar River in the Iowa flood of 2008, which closed the highway for seven weeks.
Iowa Highway 31 is a diagonal state highway which runs from Iowa Highway 141 (Iowa 141) in Smithland to U.S. Highway 59 (US 59) east of Quimby. For most of its length, the highway runs parallel to the Little Sioux River. Since its designation, the route has changed very little. The route was paved by the mid-1960s.
Iowa Highway 39 is a north–south state highway in western Iowa. It begins at an intersection with U.S. Route 59 and Iowa Highway 141 on the western edge of Denison. The route ends at its intersection with Iowa Highway 175 on the eastern side of Odebolt.
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. The route in Iowa begins at the Missouri River crossing at Blair, Nebraska, and ends at the Mississippi River crossing at Clinton, Iowa. Along the way, it serves Denison and Carroll in western Iowa, Boone, Ames, and Marshalltown in central Iowa, and Tama, Cedar Rapids, and DeWitt in eastern Iowa. Cutting across the central portion of the state, US 30 runs within close proximity of the Union Pacific Railroad's Overland Route for its entire length.
Iowa Highway 16 is a state highway running from west to east in southeastern Iowa. The highway has a length of 65.18 miles (104.90 km). The western terminus of Iowa Highway 16 is at an intersection with U.S. Highway 34 (US 34) between Agency and Batavia. The eastern terminus is located at Wever at an intersection with US 61.
Iowa Highway 96 is a state highway which runs from west to east in central Iowa. It begins at Iowa Highway 14 southwest of Conrad and ends at U.S. Highway 63 east of Gladbrook.
Iowa Highway 78 is a 59-mile-long (95 km) state highway which runs from east to west in southeastern Iowa. The route begins east of Martinsburg at Iowa Highway 149, and ends at U.S. Highway 61 east of Morning Sun. The route has existed since the 1920s, when it was a short spur route between Olds and Winfield. By the 1950s, the route reached its current extents.
Iowa Highway 58 is a state highway that runs from north to south in northeast Iowa. A five-and-a-half-mile (8.9 km) portion of the highway is overlapped by the Avenue of the Saints. Iowa 58 begins at U.S. Highway 63 (US 63) in Hudson and ends at an interchange with US 218 and Iowa 57. Iowa 58's route has changed many times in its history, but has always served Black Hawk County.
Iowa Highway 56 (Iowa 56) is a state highway that runs from west to east in northeastern Iowa. It begins at Iowa Highway 150 in West Union and ends at Iowa Highway 13 south of Elkader. As a largely rural route, Iowa 56 passes through the farmland of Fayette and Clayton counties. Through Elkader and to its eastern end, the highway runs parallel to the Turkey River.
Iowa Highway 150 (Iowa 150) is an 85-mile-long (137 km) state highway in eastern and northeastern Iowa. It begins at U.S. Route 218 (US 218) in Vinton and ends at US 52 and Iowa 24 in Calmar. From Vinton, it heads north and east towards Urbana where it meets Interstate 380 (I-380) and Iowa 27, the Avenue of the Saints highway. At Independence, it intersects US 20 on the south side of town. Further north, it converges with Iowa 3 in Oelwein.
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 212 was once a much longer highway, nearly 37 miles (60 km), covering parts of the Lincoln Highway.
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 with U.S. Route 63 at New Sharon, and ends at a freeway interchange with U.S. Highway 30 at Le Grand. While the route Iowa 146 takes has remained the same since its creation, the highway has been extended at least twice because of realignments of U.S. Route 30 near Le Grand. The northernmost 2 miles (3.2 km) were once part of the Lincoln Highway.
Iowa Highway 202 is a short state highway in southern Iowa. The route begins at the Missouri state line, where it continues as Missouri Route 202, and ends at Iowa Highway 2 north of Moulton.
Iowa Highway 346 is a short state highway in north-northeastern Iowa. Iowa 346 begins at U.S. Route 218 / Iowa Highway 27 at Nashua, Iowa and ends at the intersection of U.S. Highway 18 and U.S. Highway 63 south of New Hampton.
U.S. Highway 18 (US 18) is the northernmost east–west United States Numbered Highway in the state of Iowa. As with all state highways in Iowa, it is maintained by the Iowa Department of Transportation. It enters the state by crossing the Big Sioux River between Inwood and Canton, South Dakota. It travels about 312 miles (502 km) and connects Spencer, Mason City, and Charles City. The highway leaves the state via the Marquette–Joliet Bridge over the Mississippi River at Marquette. Prior to becoming a U.S. Highway, the route US 18 follows was known as Primary Road No. 19 and the National Parks Pike.
U.S. Highway 63 (US 63) is a United States Highway that runs through the eastern third of Iowa. It begins at the Missouri state line southwest of Bloomfield and travels north through Ottumwa, Oskaloosa, Tama, Waterloo, and New Hampton. It ends at the Minnesota state line at Chester. Between Ottumwa and Oskaloosa, the highway is a four-lane controlled-access highway. Through Waterloo and New Hampton, it is partially controlled; that is, the road as both grade-separated interchanges and at-grade intersections. The rest of the highway is largely a two-lane rural highway.