Map showing relationship of East Rainy Butte to Lake Ilo National Wildlife Refuge
 

Map of Earthnaming Sites and Hidatsa Territory

Map drawn by Bears Arm, pg. 12, Bowers, Alfred W., Hidatsa Social and Ceremonial Organization,1992 Univerisity of Nebraska Press

The Rainy Buttes are not noted on many early maps of the Dakota Territory.  Geographic features at any distance from the Missouri were little known or referenced. Below is a list of maps which reference Rainy Buttes historically.  All maps are from the Map Room at the Library of Congress, Washington D.C.

1855  Lt. Warren's Report of Military Reconnaissance in the Dacota Country
            The Cannonball River is referred to as Inya Wa Karap.

1861-62 & 63        G.K. Warren on Harney Campaign, Military Map
            Rainy Buttes is not on map of U.S. Land Survey.

1872    Rice's Sectional Map of Dakota Territory, draughted by Fred Sturneck, draughtsman Q.M. Dept. of Dakota;
             published by the St. Paul Lithography and Engineeriing Co.
            Shows General Sully's trail from Ft. Rice up Cannonball
            Notes survey trail by N.P.R.R. along Heart River.