Check out the new recreational guide for Nockamixon stat park. Most of the mountain bike trails made the map except for the upper eastern woods. We are working on getting that section added to the free Pocket Ranger™ App by Parks by Nature which is a cool app that shows you where you are on the trail system, with a smart phone. The printed guides should be available in the next few weeks.
Valley Mountain Bikers is listed in the guide under friends groups.
http://www.dcnr.state.pa.us/cs/groups/public/documents/document/dcnr_003...