The most enjoyable season to visit the rookery is when the great blue herons are nesting.
 From the east parking area, you can follow the trail northwards to the East Arm Little Calumet River.
 Across the river on the north bank is the rookery.
 Annually, these great birds return to nest.
 The great blue heron is the largest of the North American heron families.
 They stand 4 feet (1.2 m) tall and have a wingspan of 7 feet (2.1 m).
  It is best to visit with a ranger on a guide walk as the birds can be hard to find, high in their nests.
If you continue west along the trail, you’ll follow the Little Calumet River for over a mile through a hardwood forest.

The herons roost in the eastern end with its tall sycamores.
 As you move towards the west, the woods become denser with beech, tulip poplars and maples.
 Here, there are a variety of smaller birds, including kinglets, wood thrushes, woodpeckers, and warblers.
The most enjoyable season to visit the rookery is when the great blue herons are nesting.  From the east parking area, you can follow the trail northwards to the East Arm Little Calumet River.  Across the river on the north bank is the rookery.  Annually, these great birds return to nest.  The great blue heron is the largest of the North American heron families.  They stand 4 feet (1.2 m) tall and have a wingspan of 7 feet (2.1 m).   It is best to visit with a ranger on a guide walk as the birds can be hard to find, high in their nests. If you continue west along the trail, you’ll follow the Little Calumet River for over a mile through a hardwood forest.
The herons roost in the eastern end with its tall sycamores.  As you move towards the west, the woods become denser with beech, tulip poplars and maples.  Here, there are a variety of smaller birds, including kinglets, wood thrushes, woodpeckers, and warblers.
Heron Rookery