U.S. Route 23 Business (Ann Arbor, Michigan)
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| Location: | Ann Arbor |
| Length: | 5.781 mi (9.304 km) |
| Existed: | 1962–present |
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| Location: | Fenton |
| Length: | 3.009 mi (4.843 km) |
| Existed: | 1958–2006 |
| History: | Southern 1.723 mi (2.773 km) unsigned after 1975 |
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| Location: | Saginaw |
| Length: | 8.006 mi (12.884 km) |
| Existed: | 1953–1961 |
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| Location: | Bay City |
| Length: | 2.714 mi (4.368 km) |
| Existed: | 1941–1961 |
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| Location: | Rogers City |
| Length: | 4.074 mi (6.556 km) |
| Existed: | 1942–present |
| Tourist routes: |
 Lake Huron Circle Tour
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There have been five different business routes of US Highway 23 in the state of Michigan. These business routes were designated along former sections of US Highway 23 (US 23) to provide signed access from the main highway to the downtowns of cities bypassed by new routings of US 23. Two are still extant, connecting through downtown Ann Arbor and Rogers City. Three others have been decommissioned. The former Business US 23 (Bus. US 23) in Fenton was split in half during the 1970s and later completely turned back to local control in 2006. The former business loops through Saginaw and Bay City were renumbered as business loops of Interstate 75 in the 1960s.
Business US Highway 23 (Bus. US 23) is a business loop of US 23 through downtown Ann Arbor. The southern end is at an interchange with US 23 on the city line with Pittsfield Township. This interchange also marks the western terminus of M-17, and the eastern end of a concurrency with Business Loop Interstate 94 (BL I-94). From this interchange westward, BL I-94/ Bus. US 23 follows Washtenaw Avenue along a five-lane street past commercial areas to County Farm Park and then continues as a four-lane roadway through residential neighborhoods. Washtenaw Avenue turns more northwesterly at the intersection with Stadium Boulevard southeast of Burns Park. Near the Central Campus of the University of Michigan, Washtenaw Avenue turns due north to cross part of campus before BL I-94/Bus. US 23 turn due west onto Huron Street near Palmer Field. Bus. US 23 follows BL I-94 and the four-lane Huron Street into downtown Ann Arbor to the intersection with Main Street. There, Bus. US 23 turns northward onto Main Street and exits downtown. Main Street has four lanes as it runs northward into a residential area. It parallels part of the Huron River before ending at an interchange with the M-14 freeway about a mile and a third (2.2 km) north of downtown. At that interchange, Bus. US 23 merges onto the freeway and runs concurrently with M-14, crossing the Huron River. There is one interchange for Barton Drive and Whitmore Lake Road on the northern bank of the river. The freeway runs through a wooded area and then after about one mile (1.6 km), it meets US 23 at an interchange in Ann Arbor Township that marks the northern terminus of the business loop.
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