Cowles Bog

Cowles Bog is a National Natural Landmark with historical significance as well as being a great place to hike and explore. The name honors Dr. Henry Cowles (pronounced Coles) of the University of Chicago; his field work in this area was important in the development of the science of ecology.



There are two parking areas, but I recommend using the one closest to the entrance to Dune Acres. After parking, retrace your path along the one-lane dirt road and cross the Dune Acres entrance road.

The trail sticks to the northern edge of a wetland, occasionally crossing wet areas on boardwalks. Ferns are everywhere, and I canít recall a summertime visit when I didnít see a least one snake. Mosquitoes can also be annoyingly abundant.

At the first junction turn right and climb into a savanna-like area on the lee side of the dunes. Continue bearing right at intersections; you will eventually hear the lake, and then on topping a final dune see the beach below and the lake stretching to the horizon.


The descent to the beach is sandy and steep; remember that you will need to climb back up and out when you are ready to leave. Youíll pass marram grass in the foredunes, an important plant whose roots do much to hold dunes in place.

Cottonwood trees survive relatively close to the beach. As sand piles up around them, buried branches turn into roots, and the plant continues to grow. Look for sea rocket, cocklebur and bugseed as you make your way west along the beach.

The western path away from the beach is not terribly obvious; look for footprints at a break in the dune. After climbing up from the beach, you will top the dune and descend somewhat, traversing again the same savanna-like habitat that you walked through on your way to the beach. In the process, youíll top several smaller rises. An immense steelworks is occasionally visible just to the west.

Itís possible and sometimes interesting to return to the south trail head and then, if youíve parked your vehicle at the north lot, walk along Mineral Springs Road back to your car. I prefer to turn left in the south-central portion of the preserve, and return via the path I entered on. The return trip offers a different perspective, and often reveals things initially unseen.


Porter County. From the intersection of US 12 and IN 49, go west 1.4 miles on US 12 to Mineral Springs Rd, then north 0.7 miles, turning right onto a one lane dirt road just before the guard shack. Park in the lot at the end of the lane.

North 41 38.714 West 87 05.087
DeLorme 19:B8

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Chemical toilet.

Nearby Natural Areas

Indiana Dunes State Park
Inland Marsh
Kemil Beach
Little Calumet River Trail
Ly-co-ki-we Trail
West Beach


Bloom: Hiking Indiana; Page 15
Habeck: Wild Indiana; Page 14
McPherson: Indiana Best Hikes; Page 120