To this end, Molly Ann Brook, which flows through the preserve, was dammed in 1919 to form the large Haledon Reservoir and an accompanying smaller basin.

There is a parking lot at this entrance, a picnic area, and the start of the preserve's main path which stretches about a half mile along the east side of Haledon Reservoir.

The main path also runs through a few areas of exposed volcanic basalt, lava that erupted to the surface 200 million years ago as the super continent Pangaea rifted apart during the early Jurassic.

[3][4] The largest outcrop occurs along the northeast corner of the reservoir, forming an approximately 50 foot wide ‘basalt beach’ that extends from the water's edge to the tree line.

This newly blazed section crosses High Mountain Road (Bergen County Route 89) at its intersection with Reservoir Drive, entering the nature preserve through a recently created opening in the perimeter fence.

A painted crosswalk and accompanying signage to alert motorists to pedestrians were installed at the intersection to facilitate safer passage over the busy county road.

[2] Common catches include largemouth bass, black crappie, pickerel, yellow perch, sunfish, giant carp, and catfish.