Bond Brook has been created and maintained by the Central Maine Chapter of NEMBA. It is a "work in progress" although land owner issues have cause some delays. There are several mini-loops off the parking area. The easiest is to take the birch entrance, follow it until it dumps you off onto a piece of double track. The single track continues straight ahead. (there is a pretty nasty switchback you have to contend with first...loose granite and slate) Follow it until you get to the power lines. From there, follow the red flags. It will loop you around until you get to the "Bicycle Trail". (there is an old rusted out bike on the side of it) Continue to follow the single track (labeled with red flags) until you get back to the lot.
The signage isn't overly clear. It is possible to get a little lost. Following all the red flags WILL help.
Take Exit 109 A to Augusta, Merge on to 202 East, Turn left on Airport road, pass the airport on your left, (you are now on Winthrop Street), take the second road on your left and drive to the back of the cemetary. The parking lot is all the way back in front of rocks. Start by heading left. The trail entrance is about 100 feet on your right. There are 2 major entrances. The first will be between some birch trees. The second is on your right shortly after. You will follow a fencline. The Singletrack is clearly marked.
http://www.singletracks.com/item.php?c=1&i=4353