National Wildlife Federation: Bald and Golden Eagles. The 1993 survey was held January 1-15, and was coordinated and compiled by John Dinan, Nongame Bird Biologist with the Nebraska Game and Parks Commission, who supplied the following information. Temperatures during the survey period ranged from approximately 5 to 30 0 F. There was snow cover statewide in varying amounts, but generally deeper in the eastern third of the state. Nearly all water habitats were frozen-over weeks before the survey period. The percent of open, flowing river channel was consistently low for most rivers. While the channelized portion of the Missouri River reported the lowest percentage of ice cover (10-25%), slush and flow ice was present along its entire length....