Iowa Highway 37
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| Route information | ||||
| Maintained by Iowa DOT | ||||
| Length: | 40.231 mi (64.746 km) | |||
| Major junctions | ||||
| West end: |
 Iowa 175 near Turin
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 US 30 in Dunlap
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| East end: |
 US 59 near Earling
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Iowa Highway 37 (Iowa 37) is an east–west road in the west-central part of the state. Iowa 37 begins just east of Turin at Iowa Highway 175. It ends four miles (6.4 km) east of Earling at U.S. Highway 59. A small portion of the highway near Turin is designated as part of the Loess Hills Scenic Byway.
Iowa Highway 37 begins at an intersection with Iowa 175 east of Turin and adjacent to Iowa 175's crossing of the Maple River. The first one and a half miles (2.4 km) of the route are part of the Loess Hills Scenic Byway. The highway travels east and then southeast through the Loess Hills, a region of dunes east of the Missouri River created by wind-deposited silt from the Missouri River valley. At Soldier, Iowa 37 exits the Loess Hills and meets Iowa 183. From Soldier, the highway travels 13 miles (21 km) to the southeast to Dunlap. In Dunlap, Iowa 37 overlaps US 30 for one-quarter mile (400 m). Eastbound Iowa 37 overlaps westbound US 30; this phenomenon is known as a wrong-way concurrency. Between Dunlap and Earling, Iowa 37 travels in a stairstep path to the south and east for 13 miles (21 km). At Earling, the highway intersects the northern end of Iowa 191. Its last section is four miles (6.4 km) long, connecting Earling to US 59.
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