Barnes Brothers Marine is a full-service marina on Lake Hopatcong offering boat access via slips accommodating vessels up to 250 feet, along with a gas dock and marine store.

The facility provides boat sales, repair and maintenance services, and both indoor and outdoor dry storage options. Located at 11 Windermere Avenue in Mount Arlington, it has been serving boaters since 1925 and is open seven days a week from 8 a. m. to 6 p. m.