Collection of information regarding Platte River Basin diversions included photographing selected diversion structures and tabulating Wyoming State Engineer’s Office (SEO) permit information regarding these structures. Major diversions were generally those that are permitted by the SEO to convey 50 cubic feet per second (cfs) or greater flow and were identified by a process including assessing an SEO database of basin diversion information, discussions with SEO hydrographers, and review of the 1999 Tabulation of Adjudicated Surface Water Rights of the State of Wyoming. The advice and assistance of SEO hydrographers, both in the office and in the field, was essential to the successful completion of this work. Major diversions in the Lower Laramie subbasin were not photographed, due either to private property access issues or very remote locations.