Where the Dunes Give Way to the Largest Wetland on Lake Michigan

Indiana Dunes National Park is famous for its sand dunes and Lake Michigan shoreline — but tucked behind Beverly Shores, away from the beaches, is something most visitors never find. The Great Marsh Trail leads into the largest interdunal wetland in the Lake Michigan watershed: a quiet, flat, one-mile lollipop that delivers open water, migrating birds, spring wildflowers, and one of the most compelling conservation comeback stories in the National Park System. The dunes are the headline, but the marsh is the story you didn’t know you were coming to find.

The Great Marsh Trail is one of the most accessible and rewarding short walks in Indiana Dunes National Park. Even visitors with limited time or mobility can reach the observation deck from the north lot on the paved path — and from there, the view across the open marsh is reason enough for the stop.

Getting to the Trailhead

The Great Marsh Trail has two parking areas, both located north of U.S. Highway 12 on Broadway Avenue in Beverly Shores, Indiana. The south lot is the main trailhead for the full lollipop loop. The north lot — the one closest to the observation deck — has limited parking (one accessible space and one regular spot) but offers the shortest walk to the marsh overlook. We started from the north lot, which puts you at the heart of the experience almost immediately.

Indiana Dunes National Park is located along the southern shore of Lake Michigan, roughly an hour southeast of Chicago. Beverly Shores sits near the eastern end of the park. If you’re making a day of it at Indiana Dunes, the Great Marsh Trail pairs naturally with the Dune Succession Trail at West Beach — two very different landscapes within the same park, separated by about fifteen minutes by car.

Hiking the Trail

From the north lot, the paved path leads almost immediately toward the marsh. Even before you reach the observation deck, the wetland announces itself — red-winged blackbirds calling from the cattails, the soft sound of water, and on the afternoon we hiked it, the distant bugling of Sandhill Cranes somewhere out in the open water. The path is flat and easy, raised just above the marsh surface, with the wetland pressing close on both sides.

The observation deck extends out over the edge of the marsh and is the one place on the trail where you step off the raised path and feel truly surrounded by it. The view opens across open water, sedge meadows, and low tree lines in the distance — a wide, quiet panorama that rewards patience and binoculars. We spotted Sandhill Cranes at a distance across the water, along with Swamp Sparrows low in the cattails and Northern Flickers moving through the trees on the return loop.

From the observation deck junction, the lollipop loop continues east and north through a wooded interior — a quiet contrast to the open marsh. This section feels enclosed and shaded, with early spring light filtering through bare branches and the first wildflowers of the season pushing up through the forest floor. The loop completes and returns you to the junction, where the stem path leads back to the north lot. The whole walk is about a mile, with no elevation change from start to finish.

Highlights Along the Way

The Great Marsh Observation Deck

The observation deck is the centerpiece of the trail — the one vantage point where the full scale of the marsh opens up in front of you. Bring binoculars. The Great Marsh is a designated birding destination, and the deck is the best spot to scan for Sandhill Cranes, Great Blue Herons, egrets, ducks, and the warblers and blackbirds that move through in force during spring and fall migration. In April, the marsh is particularly active — the spring migration is underway, and the wetland fills with birds pausing on their way north.

The Wooded Interior Loop

The loop section of the lollipop winds through a wooded interior that most visitors on a quick out-and-back to the deck never reach. It’s a different character than the open marsh — quieter, more enclosed, with the early spring understory just beginning to wake up. Northern Flickers work the tree trunks, Swamp Sparrows hide in the brush at the woodland edge, and the first wildflowers of the season appear along the path in April. It adds only a short distance to the walk and is well worth completing.

Spring Wildflowers

An April visit catches the Great Marsh Trail at a transitional moment — the marsh is waking up, the birds are moving through, and the first blooms of the season are appearing along the trail edges and in the wooded loop. Early spring at the marsh brings marsh marigolds and other wetland bloomers pushing through the wet soil, with more variety following through May and into summer. The combination of open wetland and shaded woodland on this trail supports a wider range of plant life than trails that stay in one habitat type throughout.

What Makes This Trail Special

The Great Marsh Trail earns its place not by distance or drama but by what it shows you and what it represents. This is the largest interdunal wetland in the Lake Michigan watershed — a habitat type that once stretched twelve miles along the Indiana lakeshore and was reduced to a fraction of that by draining for farms and development in the early twentieth century. The National Park Service began restoring this portion in 1998, and what you walk through today is the result of more than twenty-five years of patient recovery. The fens, sedge meadows, and wet prairies are thriving again. The birds have returned. The water is cleaner. It is a short walk with a long story behind it.

Tips for Visiting

• Bring binoculars — the observation deck rewards them, and birds at the marsh tend to be spread across open water at a distance.
• Visit in spring or fall for the best birding; migration periods bring the greatest variety of species through the marsh.
• Complete the full lollipop loop — the wooded interior section is easy to skip if you’re short on time, but it adds worthwhile variety and wildlife.
• The trail can be wet and muddy after rain; waterproof shoes are a good idea in spring.
• Check yourself for ticks after the hike — tick season in the dunes area runs from spring through fall.
• There are no restrooms or water at either trailhead; plan accordingly, especially if combining with other trails in the park.

A Marsh Restored

The story behind the Great Marsh is as worth understanding as the marsh itself. During the late nineteenth and early twentieth centuries, this entire wetland system — which once extended from Gary to past Michigan City — was systematically drained through a network of dikes and ditches, converted to farmland and residential lots as the region developed. By the time the National Park Service began acquiring land in the area, the Great Marsh had been reduced dramatically from its original extent.

Restoration began in 1998 with the removal of drainage infrastructure and the reestablishment of natural hydrology. Over the following decades, the fens, sedge meadows, and wet prairies gradually returned — along with the birds, amphibians, and plant communities that depend on them. The marsh now serves as a natural water filter for the surrounding watershed and as critical habitat for both breeding and migratory birds. Walking the trail with that history in mind changes the experience: what looks like a peaceful wetland walk is also a record of what’s possible when land is given time to heal.

Tuesdays on the Trail Video

This trail guide pairs with our Tuesdays on the Trail video episode, where we walk the Great Marsh Trail and take in the sights and sounds of the marsh on an April afternoon at Indiana Dunes National Park.

Final Thoughts

The Great Marsh Trail does not ask much — a mile, no hills, half an hour. What it offers in return is a window into one of the most biologically rich and ecologically significant habitats in the Great Lakes region, and a quiet reminder that restoration is possible. Indiana Dunes National Park contains multitudes — dunes, beaches, forests, and wetlands within a few miles of each other — and the Great Marsh Trail is one of the best ways to experience a side of the park that most visitors drive past without knowing it’s there. Plan for an hour. Bring binoculars. Let the marsh be unhurried.

Helpful Links & Resources

• Indiana Dunes National Park – NPS Official Site
• Great Marsh Trail – NPS Trail Page
• Great Marsh Trail (North Lot) – NPS
• Great Marsh Trail – AllTrails

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