Background , over the Panorama Hills, then west past the Elm Creek swamp, along the south side of Burnt Mountain, across the Cedar Creek, the Cliff Stream and out past Cliff Lake to Skanee and L'Anse". This highway was designated as an extension of M-35, which ended in downtown Negaunee. Work was completed on a significant portion of the route in
Marquette County by 1926. M-35 was routed east along M-15 toward
Marquette before turning north-northwesterly toward Big Bay. This section of roadway follows the modern CR 510 in Marquette County. Similar work was completed in
Baraga County connecting L'Anse and Skanee by 1932. The section not included in CR 510, with guard rails and cement culverts One of the first tasks for the MSHD was bridging the Dead River in Negaunee Township, north of US 41. The state solved the problem by buying a bridge in Pennsylvania, where bridges of this design were more common. His UP land provided wood for the manufacture of Ford automobiles such as the
Model T, which required of lumber per car. Constructed portions were turned over to local control, becoming CR 510 in Marquette County. The Marquette County Road Commission had announced plans in 2006 to bypass the structure with a modern replacement, leaving the existing bridge as a footpath or bike path. Construction on the bypass road and replacement bridge began in October 2007. The concrete work for the replacement span was started in late 2009, with an original projected completion date of November 1, 2010. The new crossing is above river level compared to the for the 1921 span. The total budget for bridge construction was $4.5 million and an additional $1.7 million for the approach work, with an 80-percent federal, 15-percent state and 5-percent county funding split. The new bridge opened to traffic in September 2010, diverting traffic from the Steel Bridge. Completion of the new span came after about a decade of planning. ==Major intersections==