Mountain Quarries Bridge, Railway bridge in Auburn, California.

The Mountain Quarries Bridge is a concrete arch railroad bridge across the North Fork American River near Auburn, spanning the line between El Dorado and Placer counties. Built in 1912 to carry quarried rock, it is also called the No Hands Bridge and the Pacific Portland Cement Company Railroad Bridge.

Built in 1912 by the Mountain Quarries Company from San Francisco, the bridge supported transportation of mining and cement products in the region. It stands as a key structure from the region's industrial era.

The bridge's many names record its owners and setting: Mountain Quarry Cement Bridge, American River Quarry Bridge, Pacific Portland Cement Company Railroad Bridge, Auburn Concrete Arch Bridge and No Hands Bridge. It was listed on the National Register of Historic Places in 2004; the 2002 nomination calls it plain in appearance yet graceful in its rugged surroundings.

The bridge lies between El Dorado and Placer counties near Auburn, reached on foot or on horseback through the Auburn State Recreation Area; the North Fork American River runs beneath its three concrete arches. The 1912 deck carries no vehicles, so plan a walking or riding route rather than a drive.

The bridge's many names record its owners and setting: Mountain Quarry Cement Bridge, American River Quarry Bridge, Pacific Portland Cement Company Railroad Bridge, Auburn Concrete Arch Bridge and No Hands Bridge. Its 2002 National Register nomination calls it massive yet plain in appearance, with a gracefulness in harmony with its rugged surroundings.