About Who's Been Here Photos Revisions Lake Hopatcong Mount Arlington, NJ Max Depth: Over 150ft/46m Average Viz: Under 5ft/2m Entry Type: Shore Bottom Composition: Clay/Muck Aquatic Life: Might See Something Rating: 2.00 by 1 divers Winter: Under 50°F/10°C 6/22/2012 10:28 AM

Lake Hopatcong is a shore accessible fresh water dive site, located in Mount Arlington, NJ. This dive site has an average rating of 2.00 out of 5 from 1 scuba divers. The maximum depth is over 150ft/46m. The average visibility is under 5ft/2m.

Lake Hopatcong is the largest freshwater body in the state of New Jersey, USA, approximately 4 square miles (10 km²) in area. The lake is located in the mountains of northern New Jersey, north of Netcong and along the border between Sussex and Morris counties.

The lake is within the borders of four municipalities, Hopatcong, Jefferson Township, Roxbury Township, and Mount Arlington. In the 18th century, the lake existed in two separate parts known as the "Great Pond" on the south and "Little Pond" on the north.

A natural body of water, the area of the lake has been enlarged by the damming of the Musconetcong River, its natural outlet, on the southern side of the lake.

Diving is not permitted from the State Park. Viz is low and there is a lot of boat traffic. This was a source for ice so divers have found ice block cutting and moving tools.