M-33 was shifted to run south of Mio to Rose City instead, creating the M-33/M-72 concurrency in the process. An extension was added by the end of the decade southward to M-55 at Campbell, a former community east of Selkirk in Ogemaw County. An earthen highway extension of M-33 north of Atlanta to US 23 at Onaway was opened in 1934. A few years later in 1938, M-55 was realigned to follow a more direct path east of West Branch. At the same time, M-33 was extended south by a few miles to the new roadway south of Campbell and Selkirk. A lengthy northern extension was added to M-33 in 1940 when US 23 was moved to a route along the Lake Huron shoreline between Rogers City and Cheboygan. The former route of US 23 between the Afton area and Rogers City was redesignated as a discontinuous section of M-68, and M-33 was extended westward from Onaway along that highway to Afton and north to US 27 (now M-27) near Cheboygan, creating the M-33/M-68 concurrency in southern Cheboygan and Presque Isle counties. By 1945, M-33 was extended southward again, this time to terminate at M-76 in Alger. The Michigan State Highway Department rerouted M-33/M-72 near Fairview in late 1951 or early 1952, turning the former route back to local control. The last section of M-33 was paved in southern Cheboygan County in the late 1950s. In 1968, the southern end was extended slightly to end at the new M-76 freeway that opened between Alger and Standish; that freeway was redesignated as part of I-75 in 1973. A minor realignment of M-32/M-33 east of Atlanta smoothed out some curves in the road in 1996. Major intersections See also References External links M-33 at Michigan Highways 033 Dixie Highway Transportation in Arenac County, Michigan Transportation in Ogemaw County, Michigan Transportation in Oscoda County, Michigan Transportation in Montmorency County, Michigan Transportation in Presque Isle County, Michigan Transportation in Cheboygan County, Michigan