The Nebraska Game and Parks Commission has an excellent database for fishing public water. You enter what species of fish you are looking for, and a region if you desire to narrow your search. The returned webpage will give you details about that specific body of water.
"The Public Waters Guide is a searchable database of public water in Nebraska open to fishing. The database contains information on resouces by region and county. Each resource listing includes information on the name of the water body, location, common species found and any special remarks about the area."