Round Valley Reservoir
Lake · New Jersey
About this swimming hole
New Jersey's deepest lake at 180 feet, with famously clear blue water, a guarded beach, and scuba diving. The reservoir's size gives it a big-lake feel. It is the state's premier inland swim.
Good to know
| Water type | Lake |
|---|---|
| Depth | up to 180 ft; deepest lake in NJ |
| Best season | June-September |
| Fees | $10 parking weekends |
| Reservations required | No |
| Hours | 8am to 8pm |
| Parking | Recreation area lot |
| Amenities | restrooms, lifeguards, picnic tables, boat launch, hiking trails, campground |
| County | Hunterdon County |
| Nearest town | Clinton |
| Safety notes | Lifeguards seasonal in designated area; deep water beyond |
Map
Nearby swimming holes
Frequently asked questions
Does Round Valley Reservoir require reservations?
No reservations are required at Round Valley Reservoir based on current information — but verify before you go.
Is there a fee to visit Round Valley Reservoir?
Reported fee info: $10 parking weekends. Fees can change — confirm with the official link.
When is the best time to visit Round Valley Reservoir?
The best season is typically June-September.
⚠️ Verify before you go. Conditions, fees, reservations, and access can change — confirm details with the official link before visiting. Last verified: September 2026