The State Parks map said bike trail. NOT REALLY! It was as wide as a road paved, flat, no trees, open, windy. Rode back to Tracy and back. The good news is it goes all the way to Los Banos 80+ one way.
Grantline Road off of 580 northeast to mountainhouse left north to Kelso road left west to Brunis Road left to parking
http://www.singletracks.com/item.php?c=1&i=1601