Enhancing Habitat and Visitor Experience at Great Swamp National Wildlife Refuge

At Great Swamp National Wildlife Refuge, every boardwalk, bird blind, and wetland pool tells a story of conservation in action. This winter, the Renova-Princeton Hydro Joint Venture was proud to partner with the Friends of Great Swamp on a targeted habitat restoration effort. This work focused on carefully reopening areas that were historically open water but had gradually filled in with vegetation and sediment due to natural ecological succession. By setting back that succession in strategic locations, the project supports wildlife and ecological function and restores treasured views of open water along some of the Refuge’s most visited trails.

We invite you to watch the video below and explore the photos throughout this article for a preview of the transformation unfolding as well as an overview of the restoration effort and key project activities:

A Refuge of Regional and National Importance

Located in Morris County, New Jersey, just 26 miles west of New York City, the Great Swamp National Wildlife Refuge is a rare and expansive natural landscape set within one of the most developed regions of the country. The Refuge encompasses roughly 8,000 acres of freshwater wetlands, forests, and open water habitats. Ecologically, the Refuge plays a critical role along the Atlantic Flyway, providing essential resting, feeding, and breeding habitat for more than 240 bird species, including many migrating waterfowl that depend on intact wetlands as stopover sites during seasonal migrations along the East Coast. Many species also rely on the Refuge year‑round for shelter, nesting, and foraging.

The Refuge also plays a vital role beyond its boundaries. The Great Swamp acts as a natural sponge during heavy rains, storing and slowly releasing floodwaters that help protect surrounding communities. It also improves regional water quality by filtering sediment and nutrients before they reach downstream waterways.

For people, the Refuge is an irreplaceable resource, offering quiet trails, boardwalks, educational programs, and opportunities to experience wildlife just a short drive from dense urban centers. Places like the bird blind and boardwalk trails connect visitors directly to the landscape, making habitat quality and visibility especially meaningful.

Maintaining the delicate balance between natural processes and public access is at the heart of good refuge stewardship, and that balance is what this recently completed project with the Friends of Great Swamp supports.

The Project at a Glance

Over time, sediment accumulation and dense vegetation growth near boardwalks and the bird blind reduced open water areas that are valuable for dabbling ducks and other waterfowl; aquatic macroinvertebrates and breeding amphibians; and wildlife observation and education.

This project focused on selectively removing accumulated sediment and vegetation in three targeted areas to restore open water conditions without disturbing the broader wetland system. Because of the Refuge’s sensitivity, the work was completed using a custom, field‑driven approach, which allowed project ecologists, engineers, and construction crews to respond directly to site conditions while maintaining strict permit compliance.

Key elements included:

• In‑field design and ecological oversight, with project boundaries carefully flagged and approved in advance
• Time‑of‑Year compliance, ensuring all work occurs before seasonal wildlife restrictions take effect
• Specialized amphibious and long‑reach equipment that can work in wetland conditions while minimizing disturbance
• Temporary access paths designed to be as short and limited as possible
• On‑site reuse of woody material, leaving beneficial logs and branches in place to provide habitat

Focus Areas

The work centered around three primary locations:

Area 1 – Boardwalk to Bird Blind: Selective sediment and vegetation removal on both sides of the boardwalk to restore water flow and visibility.

Area 2 – West of the Bird Blind: Reopening a ponded area while maintaining an undisturbed buffer near the blind itself.

Area 3 – Near the Parking Loop: Restoring open water on both sides of the trail boardwalk closest to the main visitor area.

Together, these efforts improve habitat connectivity, enhance wetland function, and bring back open water views for visitors to enjoy. The project also creates opportunities for future habitat enhancements. As conditions allow, select areas may later be planted or seeded to support native aquatic and wetland species and reinforce the long‑term ecological value of the restored areas.

We’re grateful for the opportunity to support the Friends of Great Swamp and to contribute to the ongoing care of this remarkable landscape. To read more about our ecological restoration work, click here.

• Natural Resource Management
• Wetland Restoration