• A quiet summer walk through the Marching Bear Group of effigy mounds

    Effigy Mounds

    National Monument Iowa

Wetlands, Marshes and Swamps

Nature and Science

Buffalo pond wetland

The backwaters of the Mississippi River consist of sloughs, lakes, ponds and adjacent wetlands. The backwaters are home of many interesting plants and animals.

The Yellow River wetlands, within Effigy Mounds National Monument, are made up of the slow moving river, and the adjacent floodplain, several small shallow ponds and a tributary stream, Dousman Creek. The wetlands contain habitat for many resident and migratory birds. In spring and fall, wood ducks, mallards, Canada geese and other waterfowl can be found feeding and resting in the quiet waters of Founder’s Pond. From the Founder’s Pond overlook, visitors can often see bald eagles and an occasional osprey during migration.

Many types of amphibians utilize the wetlands as well. Spring peepers, western chorus frogs, green frogs, leopard frogs, pickerel frogs and bullfrogs and American toads can be found here. In early spring the chorus of frogs rises from the ponds and continues through early summer as various species begin their ancient courtship ritual. In summer, the trill of the common gray tree frog can be heard from the trees and shrubs near the water.

There are also animals such as the beaver, muskrat, river otter and mink found in the quiet sloughs and at rivers' edges.

Effigy Mounds National Monument Aquatic Invertebrate Resource Brief

Effigy Mounds National Monument 2010 Aquatic Invertebrate Report

Did You Know?

Yellow River Bridge Trail Heading Towards the Heritage Addition

In the summer of 1831 Lieutenant Jefferson Davis — later Secretary of War and President of the Confederate States of America — superintended work at a U.S. Army sawmill now located within the "Heritage Addition" of Effigy Mounds National Monument.