County Road 510 (Marquette County, Michigan)

County Road 510
CR 510 highlighted in red with "Blind 35" in grey and Old CR 510 in purple
Route information
Maintained by MCRC
Length	26.103 mi[1] (42.009 km)
Existed	1939[2][3]–present
Major junctions
South end	CR 502 in Negaunee Township
Major intersections	Co. Rd. AAA near Big Bay
North end	CR 550 near Big Bay
Location
Country	United States
State	Michigan
County	Marquette
Highway system
Marquette County Roads

County Road 510 (CR 510, Co. Rd. 510) is a primary county road in Marquette County, Michigan, that connects Negaunee Township with the community of Big Bay. The road runs through rural forests as a paved and dirt road in northern Marquette County. It crosses the Dead River near the Hoist and McClure dams and runs for 26.103 miles (42.009 km) before terminating at an intersection with CR 550 south of Big Bay.

The road was originally part of the State Trunkline Highway System as M-35. In 1919, the highway was to run through the Huron Mountains in northern Marquette County. A bridge was moved from rural Pennsylvania in 1921 to carry the road over the Dead River. The Huron Mountain Club opposed the highway, and with the aid of Henry Ford, the road's construction was stopped during the 1920s, leaving a gap in the routing through the mountains. In 1939, the state transferred control of M-35 to local authorities, and the Marquette County Road Commission (MCRC) designated it CR 510. Since that time, the bridge over the Dead River has survived a flood in 2003, and it was bypassed in 2010 by a new section of road with another bridge over the river.