Waterloo Mountain rises steeply above Waterloo Lake and the Musconetcong River. The true summit is a small, viewless cone, but there are cliffs which offer expansive views to the south and east.
Waterloo Mountain is well-covered by the Pebble Trail (marked yellow). In conjunction with the 517-Waterloo Trail, the Pebble circles Waterloo mountain, passing by some views and a gigantic glacial erratic. The true summit is off trail, near the Pebble Trail/Highlands Trail junction.
From the picture, the viewpoint along the Highlands Trail, just below the Eastern summit bump.
Parked at the Waterloo Village parking lot and crossed the street to the Highlands Trail since the trail head had not been plowed. Took the Highlands Trail up as close as I could get to the summit and then bushwhacked the final few hundred feet.