I was on EBMUD property near Briones Reservoir the other day and noticed "Mokelumne Coast to Crest Trail" signs. Mostly I was ticked off about how little access EBMUD allows, supposedly to protect the watershed but at the same time allowing cattle grazing that I assume produces way more erosion and poop-in-water-itis, but I figured I'd look into this MC2C Trail. From the website, it doesn't look like it's moving along very fast, but it's a nice idea. It'd be a nice way to get to the Sierras from the coast. The American Discovery Trail already does the same thing, but further north and with a lot of pavement and by going through downtown Sacramento. Maybe if the MC2C ever got finished it would be a prettier way to traverse the foothills, although I bet there'd be a million cows.
Map of proposed MC2C.