Osborn/Treasure/Nienstedt Island (Manasquan River)

Osborn/Treasure/Nienstedt Island (Manasquan River) At A Glance...

• Exclusively accessible by boat, kayak, or other watercraft, adding to its secluded charm.
• Historically visited by famed author Robert Louis Stevenson in May 1888, who was so impressed he called it 'Treasure Island.'
• Features inviting sandy beach areas perfect for landing small craft, picnicking, or just relaxing by the water.
• Contains a small wooded interior with informal trails for brief nature walks. Watch out for poison ivy!
• Todays Sunrise: 7:04 am,   Sunset: 4:32 pm  
• New Jersey Shore Region Monmouth County

• Trails:

  • Flat / Easy

  Park Type:

  • Historic Area

Contact / Location

A Brief History

The island was known as Osborn Island in the 19th century. Its most notable historical event occurred in May 1888 when Robert Louis Stevenson, the renowned author of "Treasure Island," visited while staying in Brielle.

Captivated by the island, he playfully re-christened it "Treasure Island" (five years after his novel was completed) and even carved his initials into a bulkhead.

The island was later donated by the Nienstedt family to the Borough of Brielle, and it was officially named Nienstedt Island in their honor, ensuring its preservation for public enjoyment.

A monument or sign on the island acknowledges this donation.

Trail & Path Info

The island features a network of informal, user-created trails that wind through its wooded sections. These trails are generally flat and offer an easy, though brief, walking experience. Visitors should exercise extreme caution as poison ivy is prevalent throughout the vegetated areas.

Things to See & Do

Within the limits of the island, you will find a monument dedicated to the original owners of the island. Many say this monument is haunted and cursed. Ok .. no one says that.. we just wanted to add some fun to this page :)

Trip Ideas

Short Trip: Gull Island to Nienstedt (3 miles total)

Many people will use this as their "middle point" of a boating trip. We have launched our kayaks many times from Gull Island in Point Pleasant, paddled under the Rt 35 bridge, and up to the island. While there we would relax, have some grub, and head back. The overall trip is about 1.5 miles each way.

Longer Trip: Manasquan Wildlife Management Area to Nienstedt (8 miles total)

A second, but much long kayaking / paddling trip would be to start upstream in the Manasquan Wildlife Management Area. This is a much longer paddle, but is also very pretty!

Tips and Tricks

• Check Tides and Weather: The Manasquan River is tidal and can have strong currents. Plan accordingly.
• Beware of Poison Ivy: It is widespread on the island, especially along trails. Long pants and closed-toe shoes are advisable if exploring.
• Leave No Trace: Pack out absolutely everything you bring in. There are no trash disposal facilities.
• Safety First: If paddling, use appropriate safety gear (PFDs, etc.). Be aware of boat traffic, which can be heavy.
• Footwear: Water shoes or sandals are good for the beach, but consider sturdier shoes for trails.

Picnics / Lunches / Eating

• Visitors must bring all their own food, drinks, and supplies as there are no concessions or facilities.
• The sandy beach areas are ideal for laying out a blanket and enjoying a meal.
• Crucially, all visitors must pack out all their trash to help keep the island pristine.

Facilities

• Sandy beach areas suitable for landing watercraft.
• Informal, user-maintained trails through the wooded interior.
• A sign or monument related to the Nienstedt family's donation.
• There are NO restrooms, drinking water sources, picnic tables, grills, or trash receptacles. Visitors must be entirely self-sufficient.

Parking

Ample boat parking available. But the car parking is very limited.

Directions

Jump into a kayak / boat / canoe and drive out to the island. Or you could try swimming. Though, the boat traffic in this area may be a little much for a safe swim.