Moore Dam features 3 miles of hiking trails near Littleton, NH.
Take I93 to exit 43 and then take a left (from either north or south bound) off the exit ramp. Continue on Rt 135 north for about 500 ft - 1000 ft. and take left onto Old waterford road. Continue to the end of road about 1 mile and park in the upper lot of the boat launch area. You will see signs for the trail on the left side of the lot.
http://www.tripleblaze.com/trail.php?c=3&i=1002