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Round Valley Recreation Area is a shore accessible fresh water dive site, located at 1220 Lebanon-Stanton Road, Lebanon, NJ 08833-3115. This dive site has an average rating of 2.88 out of 5 from 8 scuba divers. The maximum depth is over 150ft/46m. Training platforms are available.

The brisk blue waters of Round Valley Reservoir attract swimmers, boaters, fishermen, picnickers and campers to its scenic shore. The Round Valley Reservoir swimming area was created by the construction of an earth dam across a narrow waterway on the west side of the reservoir, separating it from the main part of the reservoir. The reservoir covers over 2,000 acres and is approximately 180 feet deep, the deepest lake in New Jersey. It has a water capacity of 55 billion gallons. The reservoir is stocked with lake trout.

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rdal - 5/03/2019 8:14 AM
Anyone have any recent temps/vis reports?
KelvinBatista - 4/15/2019 6:17 PM
Any updates on the visibility conditions of Round Valley from either this year or last? Thanks in advance
Erik_F - 4/15/2019 7:01 PM
It was max 15 feet on Sunday at 25-50ft depth. Much less than i expected.
BeekeeperGreg - 4/01/2017 11:26 PM
Dive Buddies dove 4-1-17 , this is their report:
Round Valley is pumping in water to raise the water level. Sounds good right? Nope - viz was 6 inches below 10 feet - maybe a foot and a half above 10 feet. Never seen it so poor. Was expecting 10 to 15 feet instead we got inches....

So they are pumping for 2 months - my guess is it will take 3 months for it to get better... So July or so before I will go back... Arghhhh...
SaltyBones - 4/03/2017 3:25 PM
Erik_F - 4/03/2017 5:14 PM
A serious sad face!!!
Erik_F - 9/08/2016 6:58 PM
Rating Added: 4
Fun place to spend time with the family snorkeling the A1 area or in the beach area. Not much to see if diving randomly, but if you know where to go to find the old town, it’s pretty neat. Video of some of our foundation findings:
Erik_F - 9/08/2016 4:55 PM
Dove Round Valley on 9/4. It was 70 degrees down to 28 feet, 62 degrees at 40 feet and 52 degrees at around 50 feet. Visibility was around 15-30 feet varying at different depths. Found various foundations of the old town. Video:
DiverfromBaskingRidge - 9/05/2015 12:28 PM
I went scuba diving here on 9/5/2015. Average viz: 16-20ft/5-6m. Water temp: 50-55°F/10-13°C.

The NJ shore viz was a mess lately so I decided to try Round Valley again for an exploration of the town.

Quick video of the town at the bottom of the reservoir. Finally found it - it took all three of us to find it and find different pieces of it. I have been trying unsuccessfully for a few dives now but got it right today...
BeekeeperGreg - 8/30/2015 12:37 PM
I went scuba diving here on 8/30/2015. Average viz: 11-15ft/3-5m. Water temp: 71-75°F/22-24°C.
Vis good but not as good as the past.
The swimming area closed for the season, so the threat of the park closing due to capacity wasn’t present.
Get there early before other divers stir up the bottom.
DiverfromBaskingRidge - 8/01/2015 12:31 PM
I went scuba diving here on 8/1/2015. Average viz: 16-20ft/5-6m. Water temp: Under 50°F/10°C.
DiverfromBaskingRidge - 7/18/2015 2:32 PM
I went scuba diving here on 7/18/2015. Average viz: 16-20ft/5-6m. Water temp: Under 50°F/10°C.
Andre and I dove looking for the house foundations - we got down to about 50 to 56 feet and found a wall with cement in it so my guess is it was part of a foundation of a home. Did not get video but it was really cool down there. Went down the road and headed left or East South East...
Really cool and a bit chilly but I was surprised around 50 feet it got cloudy and cold viz dropped from 20 or 25 to 10 feet and cloudy...
BeekeeperGreg - 7/05/2015 2:24 PM
Here is a series of pictures from Round Valley.
Note the bottom kicks up easy—notice the different vis on the same dive.

Always hydrate after a dive.
DiverfromBaskingRidge - 7/05/2015 3:11 PM
Nice Job on the photos - quick video in the same area...
BeekeeperGreg - 7/05/2015 2:12 PM
I went scuba diving here on 7/5/2015. Average viz: 11-15ft/3-5m. Water temp: 76-80°F/24-27°C.
BeekeeperGreg - 7/05/2015 2:10 PM
Wife and I dove 7-5-15. Water temps around 77 surface and about 68 at 25’. Vis at least 15’.
Please note that on busy summer weekends the Park won’t allow incoming traffic if at capacity, I have seen this twice, around noon the rangers close the entrance gates.

Plenty on friendly fish closer than arms length, especially around the dive platform—-follow the rope about 75 yards off the beach in 20’ of water.
DiverfromBaskingRidge - 7/05/2015 3:25 PM
Found out the hard way on 7/4 - yesterday - pouring down rain and the park was completely full - What??? lol oh well...
DiverfromBaskingRidge - 6/28/2015 12:16 PM
I went scuba diving here on 6/27/2015. Average viz: 11-15ft/3-5m. Water temp: Under 50°F/10°C.
BeekeeperGreg - 6/28/2015 7:54 PM
Carl, Water is only 50 F. Is that on the surface? Greg
DiverfromBaskingRidge - 6/29/2015 6:01 AM
Sorry I was trying to get my dives in the Dive Log - Surface water was about 72 degrees at 50 feet the water went to 48 degrees - so it was the bottom temp I was calling out - there are some thermocliines at Round Valley that you will feel when you get low enough..
BeekeeperGreg - 6/29/2015 6:24 AM
Carl, At 72 I can get my wife out, thanks for the info.
DiverfromBaskingRidge - 6/28/2015 11:53 AM
I went scuba diving here on 4/26/2015. Average viz: 5-10ft/2-3m. Water temp: 56-60°F/13-16°C.
MDW - 1/28/2015 7:44 PM
Rating Added: 2
Shallow, very little to see
whitefang21 - 10/17/2014 1:58 PM
Rating Added: 3
not much to see under water
BeekeeperGreg - 9/03/2014 7:39 PM
Rating Added: 2
20 foot vis, warm water, fish, not much else but very enjoyable.
Parking fee, must sign in and out. Office closes at 4:30.
Mavricky - 8/28/2012 3:16 PM
Rating Added: 3

Dove it last weekend and vizibility was much better than I was use to. About 20 better. It drops off quickly to about 40’ but isn’t all that cold. Left the computer in the car and was sporting a semi-dry 8 mm so not really sure. A good place to dive and only 60 miles from Yonkers. $10 and have to register at the main gate but military free. Don’t forget to check back out again when you exit. They worry. A good thing. Not sure but don’t believe they permit solo diving.

Shore entry on small stones that turn into about 4" stones as soon as you hit the water so a bit tricky and have to be careful. I’d sure dive it again.