Iowa Highway 122
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| Route information | ||||
| Maintained by Iowa DOT | ||||
| Length: | 12.264 mi (19.737 km) | |||
| Existed: | December 6, 1999 – present | |||
| Major junctions | ||||
| West end: |
   I-35 / US 18 / Iowa 27 in Clear Lake
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 US 65 in Mason City
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| East end: |
 CR B30 at the east city limit of Mason City |
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| Location | ||||
| Counties: | Cerro Gordo | |||
| Highway system | ||||
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Iowa Highway 122 (Iowa 122) is an east–west route in Cerro Gordo County which connects the county's two largest cities, Clear Lake and Mason City. The length of the highway is 12 miles (19 km). Much of the route is constructed as a four-lane expressway with at-grade intersections. It was designated in 1999 after US 18 was rerouted onto a four-lane bypass around Mason City.
Iowa 122 begins at a diamond interchange with Interstate 35 on the eastern edge of Clear Lake. The route, overlapped by U.S. Route 18 Business, begins as a four-lane divided highway, serving the Mason City Municipal Airport before entering Mason City proper. Between Eisenhower and Jefferson Avenues in Mason City the highway is undivided. This road is the primary east–west artery through Mason City.
At Jefferson Avenue, Iowa 122 separates into a pair of one-way streets, remaining in this configuration through the downtown area where the Park Inn Hotel, one of Frank Lloyd Wright's few commercial buildings, resides. Iowa 122 intersects U.S. Route 65 at Federal Avenue. US 18 Business turns to the south to follow US 65. The one-way streets rejoin at Massachusetts Avenue forming an undivided four-lane road. The Iowa 122 designation ends at the eastern city limits of Mason City, just beyond North Iowa Area Community College.
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