Marshes Flat Road

[Max Rockatansky]

Marshes Flat Road is named after Marsh's Flat and is one of the oldest highway corridors in Tuolumne County.  This corridor originally connected Don Pedro Bar at the Tuolumne River to the original Priest Grade (now Old Priest Grade) at Moccasin Creek.  The highway reportedly had a known hideout of Joaquin Murietta and provided access to the early mining community of Indian Bar.

The final descent on Marshes Flat Road to California State Route 49 is down the Kelley Grade.  The Kelley Grade loses approximately 900 feet of elevation in one large three-quarter mile drop which requires usage of lower gears.  Marshes Flat Road is 8.4 miles long and is almost entirely comprised of single-lane roadway.

https://www.gribblenation.org/2025/12/marshes-flat-road-and-kelley-grade.html?m=1