Cottonwood River begins as two separate rivers in western Marion County. Both feed Marion Reservoir and are controlled there.
Cottonwood River drains much of Marion, Chase and Lyon Counties on the way to join the Neosho River near Emporia and then on to the Arkansas River and ultimately the Mississippi.
29.2 Water reaches the deck floor of the Old Highway K 99 bridge over the Cottonwood River.
26.5 Water reaches low steel of Old K 99 bridge over the Cottonwood River.
25.5 Highway K 99 on the north bank begins to flood.
24 Highway K 99 on the south bank floods.
23 North bank of the Cottonwood River begins to flood. Lowland flooding occurs along
the Cottonwood River from Plymouth to Neosho Rapids.
20 South bank of the Cottonwood River 1 mile south of Emporia floods.