Platte River (1-A) | Republican River (1-B) | Little Blue River (1-C) | Big Blue River (1-D) | Lodgepole Creek (1-E)
Nemaha River & Lower Missouri River (1-F) | Loup River (2-A) | Elkhorn River & Salt Creek (2-B)
Niobrara River (2-C) | White River & White Clay Creek (2-D) | Hat Creek (2-E)
Upper Missouri River & Tributaries (2-F)
