Manasquan River Inlet

Manasquan Inlet

Type:
tidal river inlet with stone jetties or bulkheads on both sides
Depth:
30 ft

This inlet has a long slightly L-shaped jetty on the north side and a longer straight jetty on the south side. Both jetties are made of large stones and concrete, and the ends are built out of man-made concrete "jacks", shaped like an H with a 90-degree twist in the middle.

Both sides have an easy climb up or down the rocks where the bulkhead meets the jetty, however, the jetties themselves are steep and tall, and would probably be impossible to climb in full scuba. An alternative is to swim around the point and come up on the beach, but it is a very long swim, and I would recommend against it unless you are a very strong swimmer. If you think about the restrictions above, you'll realize that it is completely illegal to cross from one side of the river to the other. Boat traffic in this inlet can be extremely heavy.

The "jacks" at the end of each jetty are extremely dangerous in a surge, and confusing to navigate around. Several people have died when waves pinned them into the large pockets between the jacks at this point. Avoid this area unless you are very experienced in this sort of diving, and the sea is absolutely calm.

Manasquan Inlet
Low tide, winter.
Point Pleasant on the left /south
Manasquan on the right / north
Manasquan Inlet
View of the north side from the south side. The south side is basically the same. Notice where the jetty stones end and the concrete bulkhead begins.
Manasquan Inlet
The killer jacks at the end of the south jetty.

The only times I ever dove this river, the visibility was terrible, literally zero near the end of the north jetty. The bottom is exactly the same as at the Railroad Bridge, with more sandy areas farther away from the jetties. There were huge spider crabs, big fluke in the sand, and eels, but along the whole length of the jetty, I saw not one lobster. ( Other people tell me there are many on the south side of the inlet. ) the area under the fishing bulkhead is supposed to be a treasure trove of lost articles, but there are almost always fishermen there.

Parking is free in Manasquan on the north side, metered in Point Pleasant on the south, and can be hard to find close by on both sides. On the north side, there are also showers by the beach and a food stand.

Manasquan Inlet
Looking almost straight down into relatively clear winter water. This shot is interesting because you can see the extent of the rocks under the water.

Tip: if conditions here turn out to be too rough for diving from the south side, you may still be able to dive the nearby Railroad Bridge, where the tide is about 10 minutes later. This is not true for the north side, since the north and south sides of the inlet are several miles apart by road.

All in all, I recommend the Shark River inlet over this one, especially for less experienced divers. However, I am told that conditions here can be a lot better, and I have seen pictures to prove it, so I'm not writing this one off yet.

Restrictions:

  • No time limits posted.
  • Diving permitted only within 50 ft of jetties.
  • Diving not permitted west of Ocean Ave / First Ave. Flag required.
  • Spear fishing is illegal on the north (Manasquan) side of the inlet.
  • Point Pleasant ( south Side ) has strong ( and kooky ) laws against disrobing in public, including wetsuits, although they are not usually enforced.

These restrictions are clearly posted on both sides of the inlet; also see Regulations.

Since this is a tidal river, you must dive at slack water. If you've never dived a local river or inlet before, you may want to look at the page on Local Diving Conditions.

Tides
Manasquan Inlet
Here's why you might not want to dive here - this picture was taken after Labor Day. Summer boat traffic is much heavier.
Manasquan Inlet
Heading home


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Marine Life Colonization of Experimental
Reef Habitat in Temperate Ocean Waters of New Jersey

By Bill Figley
January 2003

This investigation was partially funded by the Federal Aid to Sportfish Restoration Program

for the original paper, see here.


ABSTRACT

A biological colonization study of experimental reef habitats in temperate ocean waters off New Jersey was conducted over a 96-month period. A total of 145 different taxa of 9 phyla were identified within the experimental units, including 42 arthropoda, 37 annelida and 43 molluska. Individual organisms had an estimated mean abundance of 534,566 organisms/m2 of habitat footprint, including 105 fish, 4,639 crabs and 14 lobsters. Colonial organisms covered 87,554 cm2 of the habitat surface area. Mean total biomass of the organisms inhabiting the units was 84,175 g/m2, with blue mussel comprising 63 percent of the total. The carrying capacity of the experimental habitat for all species of marine life was about 152,801 g/m2. Predation accounted for an 80 percent reduction of biomass between surfaces exposed and not exposed to predators. There were no statistically significant differences in biological colonization rates of sessile epibenthos on concrete, rock, steel and rubber substrates. On an equivalent area basis, the biomass enhancement ratios of the experimental reef habitats over surf clam-dominated and polychaete/crustacean-dominated sand bottom habitats ranged from 35 to 1,124 and 2,773 to 3,200 times, respectively. A simplified, three-tiered reef habitat food chain consisted of 84.5 percent sessile/sedentary invertebrates, 11.0 percent mobile invertebrates and 4.5 percent juvenile and adult fish. The results suggest that complex reef habitats provide both attachment surfaces and refuge habitats that support a diverse and abundant marine life community.