This book is the first of two volumes that describe the depots owned by the Denver and Rio Grande Western Railroad. Volume I covers the majority of the buildings in the state of Colorado. The remainder of the Colorado D&RG depots and those in Utah, together with depots operated by the Rio Grande Southern and Denver & Salt Lake Railroads, will be addressed in Volume II. Descriptions of the structures, complemented by detailed drawings, are presented. Basic information includes the dates of their construction and retirement. Information was collected from primary sources. Depots in Colorado belonging to other railroads (UP, AT&SF, CBQ, C&S and smaller railroads) will be summarized in Volume III.