Summary
According to the agency website: "Hamlin Marsh is 1686 acres in size with about 88% of it in wetland habitat. The Wildlife Management Area (WMA) is about four miles long and from ΒΌ to one mile wide. Mud Creek flows into and out of Hamlin Marsh WMA and drops only about 2.4 feet as it travels through the marsh. Mill Creek flows into the marsh from the south side under Bear Road. Area topography is gently rolling land with an average elevation of about 400 feet above sea level.
Hamlin Marsh WMA was at one time the basin of post-glacial Lake Iroquois whose water level was about 70 feet above the present marsh. Poor drainage and the relatively shallow depth of water have favored the development of wetland vegetation. The organic soils created from dying wetland vegetation are over 25 feet deep in places. The marsh appears to have become wetter since the 1940's. Part of this is due to increasing human development around the wetland causing more frequent and faster water runoff into the marsh and partly due to dams downstream of the marsh.
Hamlin Marsh offers an accessible hunting blind and a separate accessible observation deck with benches, overlooking Hamlin Marsh. The deck is built at the border of a vast marshland that contains waterfowl in migratory seasons. The hunting blind is located on open water and features a 600' wooded access path with designated parking. Be advised, there is no port-a-john at either location."