Iowa Highway 23 (1926–1968)
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| Route information | ||||
| Length: | 4.655 mi (7.491 km) | |||
| Existed: | January 1, 1969 – July 1, 2003 | |||
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| South end: |
 Route 15 south of Milton
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| North end: |
 Iowa 2 in Milton |
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| Location | ||||
| Counties: | Van Buren | |||
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Iowa Highway 15 (Iowa 15) was a short state highway in Van Buren County. It ran from the Missouri state line, where it connected to Route 15 to Iowa 2 in Milton. The highway was designated on January 1, 1969, when the Iowa State Highway Commission renumbered several state highways in order to match up with adjoining highways in neighboring states. The route ceased to exist on July 1, 2003, when the Iowa Department of Transportation turned over 700 miles (1,100 km) of state highways that mostly served local traffic. While it was in service, there were two Iowa 15s in the state; the other was significantly longer and located in the northern part of the state thus avoiding confusion between the two routes.
Iowa 15 began as a continuation of Route 15 in Missouri. It headed north through the farmland of Jackson Township, the southwestern-most township in Van Buren County. The highway ran over relatively flat terrain, only undulating approximately 40 feet (12 m) over the length of the route. Near the midpoint of the route, it curves slightly to the west and then continues to the north. It enters the Milton city limits from the south. The highway ends at an intersection with Iowa 2.
Iowa 15 was designated on January 1, 1969, when the Iowa State Highway Commission renumbered several state highways. Route numbers across the state were changed in order to match up with adjoining highways in neighboring states. In this case, Iowa 23 in Van Buren County was renumbered to match Route 15 in Missouri. Similarly, Iowa 15 in Wapello County became Iowa 23. Coincidentally, a second Iowa 15 was designated at the same time in the northern part of the state. That route was previously Iowa 44 and was renumbered to match Minnesota State Highway 15.
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