Iowa Highway 150

The current Iowa 150 was created shortly after Iowa 17 supplanted the former Iowa 150 in the west-central part of the state. The new Iowa 150 replaced Iowa 11, which stretched from Calmar to Cedar Rapids via Independence, in its entirety.[11][12] Through Cedar Rapids, the highway entered from the north along Center Point Road NE. It turned west onto US 151 and Iowa 64 along 1st Avenue E near Coe College. It turned south onto 10th Street SE on which it traveled for a few blocks to the corner of Mount Vernon Road and 8th Avenue SE, which carried US 30 east and west, respectively.[13]

The current Iowa 150 originally began on the Centennial Bridge in Davenport

From Cedar Rapids, the route continued south and east by overlapping US 30 and Iowa 38 to Tipton. It also entirely replaced Iowa 74, which stretched from Tipton to Davenport.[11][12] Through Davenport, the highway entered from the northwest along the aptly named Northwest Boulevard. Further into town, it intersected Kimberly Road and then transitioned onto Harrison Street. In downtown, the highway overlapped US 61 and US 67 along 4th Street, briefly along Gaines Street, and then along 2nd Street.[14] Iowa 150 followed US 67 onto the Centennial Bridge where it ended at the state line over the Mississippi River.[15] On the Illinois side of the bridge, US 150 began at the state line.[16]

During the 1950s, as today's highway system was beginning to take shape, Iowa 150 was rerouted a couple times in Cedar Rapids. The first adjustment happened in 1954, when US 30 was taken off of Mount Vernon Road and put onto a new road on the south side of town. Iowa 150 was moved west through downtown and across the Cedar River. It turned south onto 6th Street SW, on which US 30 and US 218 joined at 18th Avenue SW. The three routes turned east onto the new road, but US 218 turned south at Bowling Street SW.[17] Within five years, Iowa 150 moved to the northeast side of Cedar Rapids and into Marion. Instead of continuing south to Coe College, it turned east at Collins Road and connected with US 151 and Iowa 64 near the eastern city limits. It then followed those two routes to downtown Marion, where it turned south onto a road which headed southeast towards Mount Vernon.[18] East of Mount Vernon, it followed US 30 to Iowa 38 and continued towards Davenport.[19] Within a few years, Iowa 150 was rerouted onto the newly extended Iowa 13, which was extended south to US 30 near Bertram.[20] At its longest extent, the route was 180.52 miles (290.52 km) long.[15]

That all changed on January 1, 1969, when the Iowa State Highway Commission reorganized its primary highway system. The commission reassigned sections of highway with new numbers and removed duplicate numbers where they were unnecessary.[21] In Iowa 150's case, the route was truncated at US 151 in Cedar Rapids. The duplications along US 151, Iowa 13, US 30, and Iowa 38 were removed and the remaining segment from Tipton to Davenport was renumbered Iowa 130.[22] The route's new length was 97.96 miles (157.65 km).[23]

The southern end of Iowa 150 changed again in 1984. After I-380, which was constructed parallel to Iowa 150 between Cedar Rapids and Center Point, was opened to traffic, Iowa 150's routing south of Iowa 101 was essentially redundant to the new interstate. As a result, Iowa 150 was rerouted over Iowa 101 south to Vinton.[24][25] The vacated section of Iowa 150 was renumbered Iowa 920 from old Iowa 101's north end to Center Point and Iowa 921 from Center Point to Cedar Rapids.[26]

In the 1980s, Iowa 150 near Oelwein was rerouted onto a new section of highway along the former right-of-way of the recently liquidated Rock Island Railroad. Originally proposed as a four-lane highway, pressure from Oelwein residents caused the Iowa Transportation Commission to approve a three-lane highway instead.[27] The new section of highway was open by 1986.[25] The old section of Iowa 150 remained on the primary highway system as the unsigned Iowa 916 until July 1, 2003.[28]

Construction is currently underway to realign the curves 4.5 miles north of Independence.[29] The project has been under discussion since the release of a road safety audit in December 2009.[30]

The Iowa 150 bridge at Vinton

On June 11, 2008, about 2 miles (3.2 km) of Iowa 150 north of Vinton closed for a few months after flood waters from the Cedar River destroyed the roadway. North of the intersection with County Road E16 (CR E16), a 400-foot-long (120 m) section of roadbed was completely washed away. By the end of the month, one lane the bridge over the Cedar River had reopened to local traffic and farmers. Reopening the bridge saved drivers from having to use a 22-mile-long (35 km) detour.[31] By August, Iowa 150 was reopened to all traffic from Vinton to CR E16. The washed-out section of highway was rebuilt, repaved, and reopened on September 10, almost three months after it closed.[32]

Iowa Highway 101 (Iowa 101) was a highway in Benton and Buchanan counties. It was an original primary highway designated in 1920 from Primary Road No. 40 in Vinton to Primary Road No. 5 in Independence. The northern half of the route was overlapped by Primary Route No. 11, which would become Iowa 150.[35] By 1924, Primary Road No. 101 was truncated to an intersection with Primary Road No. 11 west of Walker.[36] The 15.6-mile-long (25.1 km) highway would largely remain the same for the next sixty years.[24] In 1984, Iowa 150 was rerouted over the highway and the Iowa 101 designation was removed. The former section of Iowa 150 became Iowa 920 and Iowa 921.[25]

Iowa Highway 920 (Iowa 920) was the northern half of the section of Iowa 150 that was vacated when it was rerouted over Iowa 101. It began at the same intersection in Benton County west of Walker where Iowa 101 ended. Iowa 920 headed east towards Walker, where the highway skirted the edge of town by curving to the south. The route headed due south along Center Point Road for a few miles until it curved southwest and back to the southeast into Center Point. Through Center Point, the highway was known as Franklin Street.[37] In the southern part of town, where Center Point Road turned south, Iowa 920 ended.[28]

In 2002, the Road Use Tax Fund Committee, a mix of city, county, and state transportation officials, met to review and recommend changes to Iowa's public road system. The report was necessitated by increasing costs to maintain the highway system and a level of funding that was not keeping up with the rising costs. The committee identified over 700 miles (1,100 km) of state highways, including Iowa 920, which could be turned over to local jurisdictions.[38] Most of the committee's recommendations were accepted and on July 1, 2003, Iowa 920 and over 600 miles (970 km) of state highways were turned over to the counties or local jurisdictions.[39] The east–west portion near Walker was replaced by CR D62, while the north–south portion became CR W6E.[2]

The portion of Center Point Road south of Center Point was known as Iowa 921 for about a year. The 12.5-mile-long (20.1 km) route extended south to Hiawatha.[26] It was turned over to Linn County by 1986 as sections of I-380, which was being built adjacent to Center Point Road, opened to traffic.[25] The rural parts of Center Point Road became known as CR W6E, while the parts in Hiawatha are simply known as Center Point Road.[2][40]