Iowa Highway 8
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| Maintained by Iowa DOT | ||||
| Length: | 13.961 mi (22.468 km) | |||
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| West end: |
 US 63 in Traer
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 Iowa 21 at Dysart
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| East end: |
 US 218 near Garrison
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Iowa Highway 8 is a state highway that runs from east to west in east central Iowa. Highway 8 is a short state highway in Iowa, at only 14 miles (23 km) long. Iowa 8 begins at an intersection with U.S. Route 63 in Traer and ends at an intersection with U.S. Route 218 northwest of Garrison. The route has largely remained the same since its designation.
Iowa 8 begins in downtown Traer at an intersection with US 63. As it exits the small community, it turns to the southeast and then again to the east, forming a long S curve. Through Tama County, the highway travels over a plain with farmland on either side of the road. Two miles (3.2 km) west of Dysart, the road is intersected by Iowa 21, which joins Iowa 8 from the north. For the next 2.5 miles (4.0 km), the two highways run together until they reach the eastern limits of Dysart, which is also the Tama–Benton county line. Now in Benton County, the Iowa 8 continues due east. The final three miles (4.8 km) of the route are much hillier than the preceding ten miles (16 km). The highway ends at the midpoint of a 90-degree turn along US 218 northwest of Garrison.
Prior to becoming a primary highway, Iowa 8's route was a part of the Diagonal Trail, which connected Sioux Falls, South Dakota, and Danville, Illinois. Through Iowa, it passed through Davenport, Cedar Rapids, Iowa Falls, Spencer, and Spirit Lake. The Diagonal Trail was registered with the Iowa State Highway Commission on December 4, 1918. When the primary highway system was created, a portion of the Diagonal Trail was assigned Primary Road No. 58. When the eastern portion of Iowa 58 was rerouted, Iowa 8 was formed. Since its designation, the route mostly has remained unchanged. Two sharp curves east of Traer were eliminated for a straighter route with one more-gradual curve.
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