Pipeline trail leaves Moore Road
to the right at the top of the Earthen Dam
. It travels to the north, over fairly easy terrain, but the longest continuous climbing in Callahan. Some Marlborough side trails climb bigger hills, but none are the long, steady and somewhat boring slog that pipeline is. After descending the other side of the hill, pipeline ends at the Edmands Road parking lot.
While this wide smooth trail is not the most interesting, Pipeline and Edmands Road is by far the fastest way to/from the Marlborough side of the park if parked at the Millwood St. parking lot, and is a convenient way to meet up with friends who parked at the other lot.