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 Glenwood and travels east, where it meets Interstate 29 (I-29) and US 275. Through southwestern Iowa, the highway is mostly a two-lane rural road with at-grade intersections, though there are interchanges with US 59 near Emerson and US 71 near Stanton and Villisca. At Osceola, the highway intersects I-35 and US 69. Just east of Ottumwa, where the road meets US 63, it joins the four-lane Iowa 163 for the remainder of its route through the state. At Mount Pleasant, it overlaps US 218 and Iowa 27, the Avenue of the Saints Highway. From there, the road heads southeast, crossing the Mississippi River on the Great River Bridge at Burlington.

US 34 was one of the original U.S. Highways when the system was created in 1926, though it was preceded by the Blue Grass Route, a auto trail that connected Council Bluffs and Burlington. In 1920, the Iowa State Highway Commission (ISHC) assigned route numbers to roads to improve wayfinding for travelers. The Blue Grass Route was assigned Primary Road No. 8 in its entirety. Six years later, No. 8 was redesignated a part of U.S. Highway 34. In 1930, the highway became the first road to be fully paved across the state. By the 1950s, increased traffic and larger, faster automobiles rendered the original pavement inadequate, leading to straightening and widening projects.

Starting in the 1960s, parts of the route were expanded to four lanes. A section of controlled-access highway was built in Burlington, and a limited-access highway was constructed in Glenwood. During construction in Glenwood, Native American remains were discovered. The subsequent lab analysis and delayed reburial created controversy that eventually contributed to the Native American Graves Protection and Repatriation Act. In the 1990s and 2000s, the highway between Ottumwa and West Burlington was widened to four lanes as part of a project to improve the corridor between Des Moines and Burlington. Since the early 1990s, narrow toll bridges at both the eastern and western state lines were replaced by modern, toll-free bridges capable of handling high volumes of traffic.

Route description U.S. Highway 34 extends across Iowa from west to east through the southern third of the state. It enters the state by crossing the Missouri River near Glenwood and exits over the Mississippi River on the Great River Bridge in Burlington. The majority of the highway follows a two-lane road over the southern Iowa drift plain. The eastern third of the route is a four-lane expressway; part of a corridor between Des Moines and Burlington. In the early 1990s, the Iowa Department of Transportation (Iowa DOT) designated the entire length of US 34 as the Red Bull Highway, in honor of the 34th Infantry Division.

Western Iowa US 34 enters Iowa on a bridge over the Missouri River near the mouth of the Platte River. It follows a four-lane expressway that shortly intersects Interstate 29 (I-29) and US 275. The latter highway joins US 34 from the north and the two highways travel together through Glenwood. The County Road L35 (CR L35) exit in southern Glenwood was, prior to 2003, the western end of the concurrency with US 275. A few miles east of town, the highway reduces to two lanes and US 275 diverges to the south. Continuing east, US 34 briefly curves to the north and passes over the BNSF Railway line that carries the California Zephyr.

The highway heads due east past the towns of Malvern and Hastings before reaching Emerson. There, a one-quadrant interchange provides a direct connection to US 59, which passes overhead. As the highway approaches Red Oak, it eases to the south-southeast. It intersects Iowa 48 near the East Nishnabotna River at the northwestern corner of the town. East of there, the highway heads southeast toward Stanton; it straightens out easterly again near Viking Lake State Park. US 34 crosses the West Nodaway River shortly before a folded diamond interchange with US 71.

East of the US 71 junction, US 34 begins another section of highway that travels due east. Several miles pass between crossings of the middle and eastern branches of the Nodaway River, the latter crossing is on the southwestern outskirts of Corning. At Corning, there lies an intersection with Iowa 148. Still heading due east, the highway passes a cemetery at the junction with CR N46. At the end of the straight section, Iowa 25 meets the highway and the two routes head northeast toward Creston. There, the highways diverge on the western side of town and US 34 again heads to the east. The highway intersects US 169 as it enters Afton. East of Afton, US 34 and US 169 run concurrently east; the road curves to avoid crossing the BNSF Railway line. Some distance comes between the road and the rails and the highway straightens. US 169 turns off to the north and US 34 continues east toward Thayer.

Central Iowa East of Thayer, it passes Murray and then turns to the southeast in order to enter the sprawling commercial area on the western edge of Osceola. There the highway meets the entrance and exit ramps of I-35. Closer to downtown Osceola is the intersection with US 69. As it exits Osceola, US 34 passes a county park and again crosses the railroad. Rolling hills and truck lanes mark the road until just before Lucas. There, US 65 joins from the north and the two roads curve to the east and toward Lucas. The two roads split; US 65 turns to the south while US 34 curves to the northeast and then back to the southeast. On the outskirts of Chariton, US 34 Business continues along the same vector while the mainline US 34 bypasses the city to the south. On the southern side of Chariton, there is a diamond interchange with Iowa 14. Near Red Haw State Park, the Chariton business route rejoins the mainline highway.

US 34 heads due east again. It passes the small towns of Russell and Melrose, both of which lie along the curving railroad to the south, so access to the towns is provided by short connector roads. Just north of the highway is the unincorporated town of Georgetown, which is home to the historic St. Patrick's Catholic Church. The railroad passes beneath the highway before both the road and rails enter Albia. It intersects Iowa 5 on the southern end of town. The highway curves through southern Iowa farmland as it heads towards Ottumwa.

Eastern Iowa As US 34 approaches Ottumwa, an intersection with Albia Road leads traffic towards the southern half of the city. This section of Albia Road is a former section of US 34 and until recently, a section of US 34 Business. The mainline highway widens to four lanes and intersects the present endpoint of the business route at Quincy Avenue. It curves to the southeast along the bank of the Des Moines River and intersects Wapello Street, which carries both US 63 Business and Iowa 149. The junction is the southern end of Iowa 149. After a pair of interchanges, US 34 meets US 63 at a roundabout. The two highways cross the river and head generally northeast. The Roemer Avenue intersection marks the eastern end of the Ottumwa business route. Upon reaching the expressway on the eastern side of town, US 34 and US 63 head in opposite directions.

For the rest of its trek through Iowa, US 34 is routed along a four-lane expressway. It uses the eastern leg of the Des Moines to Burlington Highway, which since 2009 has carried the Iowa 163 designation when it was extended from Oskaloosa to Burlington. Prior to 2009, Iowa 163 ran from Des Moines to Oskaloosa. The application of the 163 route number gave the Des Moines to Burlington corridor a single route number. The highway bypasses Agency and Batavia to the north. Between those towns, an interchange with Iowa 16 directs traffic to Eldon and the house that served as the backdrop to Grant Wood's painting American Gothic.

West of Fairfield, the highway curves to the southeast to begin a freeway bypass of the city. It passes over the BNSF Railway and the former routing of US 34, which becomes a business route. Iowa 1 intersects the freeway south of downtown. At-grade intersections resume past the eastern end of the Fairfield business route. The expressway gradually moves to the south as it goes by Lockridge and Rome. Near Westwood, the highway abruptly curves to the northeast as the Mount Pleasant business route begins.

On the northern side of Mount Pleasant, three adjacent interchanges complete all movements between US 34 / Iowa 163 and US 218 / Iowa 27, the Avenue of the Saints Highway. The four routes briefly travel together along the eastern edge of the city. As the business route rejoins the mainline, US 34 / Iowa 163 exit and head to the southeast towards New London.

The bypasses of New London and Danville keep the expressway west and south of each community. As it approaches Middletown, home of the Iowa Army Ammunition Plant, the highway takes a 90-degree turn to the east and becomes a freeway. Between Beaverdale and West Burlington, the highway crosses Mount Pleasant Street, which formerly carried US 34. It then winds south of the main residential area of West Burlington and meets US 61. The freeway continues east and descends into the Mississippi River valley. Two exits provide access to downtown Burlington. The interchange for CR X99 sits at the foot of the Great River Bridge. The highway crosses the bridge and enters Illinois. The Iowa 163 designation ends on the bridge at the state line.

History What is now the US 34 corridor has been used, under various names, for over 100 years. The route was first organized as the Blue Grass Route in 1910 during the height of the Good Roads Movement. Then, the road was maintained by the Iowa Blue Grass Road Association, which solicited donations from people who lived along the route. Ten years later, the Iowa General Assembly passed a primary road bill which shifted the responsibility of road maintenance from associations to Iowa's 99 counties. At the same time, route numbers were applied to the new primary highway system; the Blue Grass Route was designated Primary Road No. 8. In 1925, confusion between route associations and nascent state highway systems led to the creation of the U.S. Highway System. Primary Road No. 8 was replaced by U.S. Highway 34 the next year. Paving of the highway was completed in 1930; US 34 was the first road in Iowa to be paved in its entirety.

Work on modernizing Iowa's highway system began in the 1950s, mostly by straightening and widening the original highways built in the 1930s. By the end of the 1950s and into the 1960s, sections of US 34 were identified as parts of important corridors that required expansion to four lanes. Construction on the eastern and western sides of the state, in Burlington and Glenwood, respectively, did result in parts of the highway becoming four lanes; other highway projects were cut back during the 1970s recession. At Glenwood, the discovery and handling of Native American remains led to the Native American Graves Protection and Repatriation Act. In the mid-1990s, the Iowa Department of Transportation began an ambitious project to expand seven important corridors, one of which connected Des Moines to Burlington. The portion of US 34 between Ottumwa and Burlington was finished in 2008 when the bypass of Fairfield opened. At both state line crossings, modern bridges capable of handling four-lane, high-speed traffic were built to replace old and obsolete truss bridges. The Great River Bridge over the Mississippi River opened in Burlington in 1994 and the US 34 Missouri River Bridge replaced the Plattsmouth Bridge in 2014.

Blue Grass Route