When I used to fly fish throughout the Winter months, I would often see an eagle perched in a particular dead cottonwood overlooking a stretch of slow, quiet water. In Fall, this run was typically thick with Common Carp (Cyprinus carpio) averaging around 6 pounds size, relatively easy to see with clear water. By the end of the Winter, the carp were much less numerous.
Studies in the 1980′s and early 1990′s found that individual birds returned to the same Wintering grounds each year from their Summer homes in Saskatchewan and Manitoba. An estimate of over 400 eagles are here in Winter. Don’t expect to see them in Summer, however–only four pairs are known to nest in the state.