Loons, mergansers, and a number of duck species are regularly present at Wauseon. There is a lone dead tree on the south side of the reservoir that is a popular perch for birds of prey including American Kestrel, Red-tailed Hawk, Osprey, and Bald Eagle. In some years the lower reservoir can provide a shorebird habitat. Greater Yellowlegs, Least, Semipalmated, and Spotted Sandpipers, Semipalmated Plover, Killdeer, and American Golden Plover have been observed there. Savannah Sparrows are present during summer. Pipits, Horned Larks, and Snow Buntings are possible on the rocks or the fields surrounding the reservoir in the winter.

Wauseon Reservoir is a good place to look for waterfowl in the spring, fall, and winter when it’s not iced over.