Skip to content

Places We Protect

Johnsonburg Swamp Preserve

New Jersey

View of Mud Pond through dense forest.
Mud Pond Overlock View of the glacier-formed Mud Pond, a scenic limestone wetland that supports rare plants at our Johnsonburg Swamp Preserve. © Jeff Burian
Contact Us

Johnsonburg Swamp Nature Preserve is one of the most species-rich natural areas in New Jersey.

Overview

Description

Johnsonburg Swamp Preserve celebrates true New Jersey wilderness and is considered one of the most important and species-rich natural areas in the state. Established in 1990, the 700+ acre preserve protects a spectacular limestone forest and the glacier-formed Mud Pond, a scenic limestone wetland that supports rare plants (including the carnivorous lesser bladderwort), waterfowl and iconic mammals like black bear, fox and state-endangered bobcats. 

Four miles of trails wind through the pristine habitats, with constantly changing angles and views. The rock outcrops that overlook Mud Pond to the west and north are the largest formations of their kind in the New Jersey, with “High Rocks” providing an elevated vantage point for viewing wildlife, seasonal landscape vistas, and acres of fields and forest fading off toward the Kittatinny Ridge. 

 

Access

OPEN TO THE PUBLIC

*Parking area is at the end of Old Stage Road off of Rte. 661 in Frelinghuysen.

Hours

Open year-round during daylight hours.

Highlights

Hiking, bird-watching, wildlife viewing, views of Mud Pond

Size

714 acres

Explore our work in New Jersey

Photos from Johnsonburg Swamp Preserve

Tag your preserve visits on Instagram with #JohnsonburgSwampPreserve to have your photos featured here!

A great blue heron standing in a still pond.
Lime kiln remains in a snowy forest.
A small pond surrounded by tall trees and wetland grasses.
Red columbine flowers surrounded by greenery.
A long-tailed salamander sitting on a mossy rock.
A red-bellied woodpecker perched in a tree.
A bright yellow American goldfinch resting on a tree branch.
A pond full of lily pads surrounded by tall trees.
A beaver swimming with leaf on its head.
A male wood duck standing on a large branch.
A great blue heron standing in a still pond.

Great Blue Heron: Great blue herons are the largest herons in North America. © Shutterstock / Joseph Scott Photography

Lime kiln remains in a snowy forest.

Lime Kiln Remains: Historic lime kiln remains can be found on our Johnsonburg Swamp Preserve. © Scott Sherwood / TNC

A small pond surrounded by tall trees and wetland grasses.

High Rocks Lookout: High Rocks lookout provides sweeping views of Mud Pond. © Juan Melli / Take A Hike

Red columbine flowers surrounded by greenery.

Wild Columbine: This beautiful woodland wildflower has showy, drooping, bell-like flowers. © Chris Helzer/TNC

A long-tailed salamander sitting on a mossy rock.

Long-tailed Salamander: Long-tailed salamanders are known to inhabit clean springs and seeps like those found throughout the preserve. © Shutterstock

A red-bellied woodpecker perched in a tree.

Red-bellied Woodpecker: Red-bellied woodpeckers use cracks in trees to store food for later in the year. © Chris Helzer / TNC

A bright yellow American goldfinch resting on a tree branch.

American Goldfinch: American Goldfinches prefer open habitats with shrubs and scattered trees to dense forest environments. © Shutterstock

A pond full of lily pads surrounded by tall trees.

Mud Pond: Mud pond is a limestone wetland providing excellent habitat for rare plant species, along with waterfowl and other wildlife. © TNC

A beaver swimming with leaf on its head.

Beaver: Beavers can be seen gathering dam materials. © Dale Coulombe/TNC Photo Contest 2019

A male wood duck standing on a large branch.

Wood Duck: Wood Ducks thrive in forests, swamps, freshwater ponds. © Jill Bauer/TNC Photo Contest 2019

Visit

  • What to See

    Don’t Miss: Incredible overlook of Mud Pond from “High Rocks.”

    Plants: Lesser bladderwort, which is found at only three other sites in New Jersey. This carnivorous plant produces yellow flowers and floats in the water, where it periodically extends the equivalent of a small trap door that sucks in insects that brush against it.

    Animals: Threatened wildlife that make their homes around Mud Pond include great blue herons, red-headed woodpeckers, barred owls, red-shouldered hawks, wood turtles and longtail salamanders. Red-spotted newts, though not threatened, are commonly found in the moist forested areas of the preserve.

  • Preserve Amenities
    • 4 miles of trails
    • Parking lot
    • Welcome kiosk with trail map and preserve history
    • Picnic tables and benches along trails
    • 2 lime kiln structure remains
    • High Rocks overlook
    • Limestone bedrock

     

  • Preserve Guidelines
    • Visitors should remain on marked trails
    • All dogs must be on a leash and must be picked up after
    • Horseback riding and seasonal hunting by permit only
    • Do not enter caves
    • No boating, swimming and fishing at any times
    • Please carry out all garbage with you
    • No mountain biking, rock climbing, or repelling
    • Motor vehicles, camping, alcohol, fires, and use of sound-producing devices is strictly prohibited

     

Two young kids are sitting on rocks overlooking mountains and a pond.
Hike to High Rocks The whole family will enjoy the incredible views from High Rocks. © Juan Melli / Take A Hike
Aerial view of Mud Pond.
Johnsonburg Swamp Preserve Mud Pond, at the heart of the Johnsonburg preserve, is a limestone wetland providing excellent habitat for rare plant species, along with waterfowl and other wildlife.  © Dwight Hiscano

Background

Four miles of trails wind through the pristine habitats, with constantly changing angles and views. The rock outcrops that overlook Mud Pond to the west and north are the largest formations of their kind in the New Jersey, with “High Rocks” providing an elevated vantage point for viewing wildlife, seasonal landscape vistas, and acres of fields and forest fading off toward the Kittatinny Ridge.

Johnsonburg’s water resources attracted Native Americans twelve thousand years ago and the Lenape tribe up to the late 1600s. Samuel Green, a surveyor, was one of the first Europeans to settle near Johnsonburg, which quickly became a busy town center and stagecoach stop. For the next 200 years, the region was known for its dairy farming operations. The area is now a bedroom-community suburb, but remnants of lime kilns, spring houses, dwellings and other structures from previous eras are evident when hiking the trails today.

Expand to see more Collapse to see less

Nearby Preserves

Need more nature? Visit The Nature Conservancy's other preserves.

Find More Places We Protect

The Nature Conservancy owns nearly 1,500 preserves covering more than 2.5 million acres across all 50 states. These lands protect wildlife and natural systems, serve as living laboratories for innovative science and connect people to the natural world.

See the Complete Map

Support Our Work at Johnsonburg Swamp Preserve

You can help us protect New Jersey's diverse plant and animal communities.

Donate