Two fishermen have been rescued from the Housatonic River in New Milford.  Water Witch Hose Company volunteer firefighters responded to the area near the Bleachery Dam early Sunday afternoon on a report of an overturned boat.  The two fishermen were clinging to the vessel, just outside of the dam’s backwash.  A third person was pulled from the water by a private vessel.  No injuries were reported.  Fire officials urge residents not to swim or fish in that area, saying the dangers that lie beneath the surface of this seemingly calm dam, is a backwash that has an unpredictable current and will trap even the strongest of swimmers.  They noted that it is not a recreation area and not a good fishing spot.