NBM Dive Site Resource
Round Valley Reservoir
Lebanon, New Jersey, United States
New Jersey's deepest reservoir and a longstanding training destination, retained with a prominent notice that scuba diving and snorkeling are closed for the entire 2026 season.
Save this dive site to your free member profile.
Historic Picture Placeholder
Aquatic life at this dive site
What divers may encounter
Three reviewed connections are featured here. Sightings vary by season, conditions, and chance, so they are never guaranteed.
Aquatic life research in progress
NBM is reviewing a likely local species for this position.
Aquatic life research in progress
NBM is reviewing a likely local species for this position.
Aquatic life research in progress
NBM is reviewing a likely local species for this position.
Site media
Photographs
Three views rotate from the published gallery on each visit.
Contributor media
Dive videos
Three featured video positions are reserved on every profile.Published reference location
Location map
The marker shows the public coordinates associated with this profile. Confirm current access, moorings, and departure details before the dive.Map data © OpenStreetMap contributors
Recent field observations
Diver-reported temperatures
Automatically checked observations from dives during the past 14 days. Three reports are visible at a time; scroll for more.A report that passes the automatic checks will appear here with the dive date, diver’s display name, and temperatures at each depth.
Reports are automatically checked for plausible dates, depths, and temperatures. They are observations, not forecasts; confirm conditions before diving.
Why divers know this place
Highlights
Freshwater training history, deep reservoir environment and designated scuba access when officially open.
Before you arrive
Access notes
Scuba diving and snorkeling are closed for the entire 2026 season. Retained as a temporarily closed destination. Do not enter for scuba until NJDEP posts reopening terms; when open, check in, obtain any required permit and follow buddy, flag and safety-equipment rules.
Plan within your training
Conditions and hazards
2026 closure, deep cold water, thermoclines, low visibility, boat traffic, steep drop-offs, separation and restricted dam/intake areas.
At the site
Facilities and support
State recreation-area facilities; scuba access and services are unavailable while the activity is closed.
Independent resource notice
This record is a starting point for independent verification. Access, closures, moorings, weather, currents, depth, visibility, operator availability, and site conditions can change without notice. Confirm current information with the responsible operator, property owner, managing authority, or another qualified local source before planning or attempting a dive.