Arkansas Highway 45
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| Route information | ||||
| Maintained by AHTD | ||||
| Existed: | 1926 – present | |||
| Section 1 | ||||
| Length: | 26.97 mi (43.40 km) | |||
| South end: |
 AR 96 in Hartford
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| North end: |
  I-540 / US 71 in Fort Smith
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| Section 2 | ||||
| Length: | 10.64 mi (17.12 km) | |||
| South end: |
 AR 59 at Dutch Mills
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| North end: |
 US 62
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| Section 3 | ||||
| Length: | 25.42 mi (40.91 km) | |||
| South end: |
 US 71B in Fayetteville
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| North end: |
 AR 12 near Clifty
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| Location | ||||
| Counties: | Sebastian, Washington, Madison | |||
| Highway system | ||||
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Highway 45 (AR 45, Ark. 45, or Hwy. 45) is a designation for three state highways in northwest Arkansas. The southern segment of 26.97 miles (43.40 km) runs from Highway 96 north across US Route 71 (US 71) to Interstate 540/US 71 (I-540/US 71) in Fort Smith. Another segment of 10.64 miles (17.12 km) runs Highway 59 at Dutch Mills to US 62 in rural Washington County. A third route of 25.42 miles (40.91 km) runs from U.S. Route 71B (US 71B) in Fayetteville to Highway 12 near Clifty. These routes were formerly connected until a portion of approximately 50 miles (80 km) was redesignated Arkansas Highway 59 and many United States highways were rerouted through Fayetteville.
The route begins at Highway 96 in Hartford and runs north to form a concurrency with Highway 252 through Midland. Further north, the route has an Officially designated exception of 0.45 miles (0.72 km) through downtown Hackett. Slightly north of this exception, Highway 45 runs on the Hackett Creek Bridge and continues north to Bonanza. The route intersects Highway 253 and curves east to form a concurrency with US 71. The highway splits from US 71 to the north and, entering Fort Smith and intersecting Highway 255 before terminating at I-540/US 71.
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