A lovely trail through streams and forest and old ruins, it is quite overgrown for approximately 0.5 mile west of the old stone ruins and ATT corridor, but is very passable by early winter. There are two potentially difficult stream crossings in high water conditions.
The Blue Trail begins 0.2 miles along the Purple Trail from a T-junction at the southern edge of the pond: the Trail descends to a brook, turns left along the shore for 0.2 mile, then turns right to cross a stream on rocks (difficult crossing in high water). It ascends 250′ and just before the wide ATT corridor turns right (almost a U-turn) to follow the stream bed upstream. It crosses the AT&T corridor again at 0.5 mile and continues its gradual ascent. At 0.8 mile it levels off and shortly reaches the northern edge of a field on the right, turns right to follow the edge of a field uphill (straight ahead the Trail leads in 0.2 mile to the MacGregor Preserve parking lot on Old Chester-Gladstone Road).
At 1.1 miles the Trail turns right off and reenters the forest, now on a wide path descending steadily (at this junction, walking around the edge of the field leads back to the parking lot in 0.2 mile). At 1.4 miles it passes a stone ruin “old cabin and picnic area” on the right, then goes downhill to a third junction with the AT&T corridor at 1.5 miles. The Trail turns right briefly before turning left into the woods – this section is quite overgrown in foliage season. After a short boardwalk section at 1.7 miles, the Trail crosses an unnamed brook which follows upstream through a rocky overgrown section — this is the old sawmlll area. The Trail clears at 1.9 miles, before turning right on a plank bridge over a stream at 2 miles (caution: some planks are loose or missing – only for experienced hikers), meets the Green Trail entering from the right at a “Y” junction, and ends in a clearing at 2.1 mile.