This 1,799-acre wildlife area is one mile east of Fayetteville in northern Brown County. County and township roads provide good access to the area from U.S. Routes 50 and 68.
The terrain is very flat, except for the narrow valleys of Indian Creek and Little Indian Creek, which flow westerly through the area. Approximately 60 percent of the area is open land, consisting of crop fields intermixed with fields of broomsedge and scattered sassafras, soft maple, pin oak, and gum. The remainder is divided equally between woods and brush. Pin oak, hickory, soft maple, and beech are the principal tree species. Cottonwood and sycamore are common along the streams.
All of the larger ponds and some of the small marshes have been stocked with fish. Largemouth bass, bluegill, and catfish are the most important pond fish species.
The best fishing is usually in the shallower areas of the ponds in early morning and late evening. During the day, fishing is more productive in the deeper water areas. The D.U. Greentree Marsh will be managed to establish habitat for wetland wildlife, opportunities for hunters, and a quality place to fish. The water in the marsh will be raised or lowered 2 feet maximum to protect the oak trees.
Other facilities include a horse barn, a 95-acre dog training area, a shotgun range, and an archery course (handicap accessible).
Open during daylight hours.