The reservoir was created by damming two valleys and holds approximately 55 billion gallons of water.
It is one of the few places in New Jersey where scuba diving is permitted, owing to the reservoir's extreme depth.
The park is a popular location for lake trout, which are rarely found in other New Jersey inland waters due to their requirement for deep, cold, oxygen-rich environments.
The wilderness campsites are situated on the reservoir's northern shore, requiring a three-to-six-mile hike to reach.
The site was once considered for a state prison before being designated as a recreation area in the 1960s.
Round Valley Recreation Area is home to the deepest reservoir in New Jersey, reaching depths of approximately 180 feet. The park encompasses 2,000 acres of water and over 2,300 acres of surrounding land. It is distinct for offering unique wilderness camping accessible only by hiking or paddling, as there are no drive-in campsites. The reservoir serves as a significant recreational hub for scuba diving, trout fishing, and sail boating. The landscape features rugged hills covered in mature hardwood forests. Visitors can explore more than 20 miles of hiking and equestrian trails. The water quality is maintained at a high level, as the reservoir functions as a major water supply source. Swimming is permitted only within a designated area during the summer season. The park terrain is known for its challenging slopes and glacial-influenced geology.
The elevated vantage point on the Cushetunk Trail overlooking the entire reservoir basin.
Bring a sturdy backpack for wilderness camping as all gear must be carried in and out.
Check water temperatures before swimming, as the reservoir remains very cold even in mid-summer due to its depth.
Use polarized sunglasses to better navigate the water surface when boating or fishing.
Attempting to swim outside of the designated beach area, as strong currents and rapid depth changes occur elsewhere in the reservoir.
The wilderness campsites and swimming beach are seasonal and typically close for the winter months.
Pack out all trash; maintain quiet hours in camping areas; pets must be leashed at all times.
