The Orson Winso Israelsen photograph collection consists of 1495 images that Israelsen used to document his long career as a irrigation engineer and drainage specialist. Included in the collection are images of flooding, laterals, flumes, headgates, culverts, canal and dam construction, water measuring equipment, weirs, erosion, diversions, culverts, reservoirs, and terracing. Most of the photographs were taken in Utah, but many are probably from adjoining states and a few are from Italy, Spain, and Portugal. Boxes 1, 2, and 3 contain organized and clearly labeled photographs from various projects relevant to O.W. Israelsen. Some are self-contained and titled projects, while others are loose despite a clear organization. These have been maintained in the arrangement in which they arrived. Photographs and papers in Folders 1-5 were pulled from the Project 211 addendum in MSS Coll 31. The photographs and papers in folders 6-12 were pulled from a binder labeled "Photographs-Engineering-Irrigation" New photograph numbers are consistent with original photograph numbering. The photographs and papers in folders 13-23 were pulled from a binder labeled "O.W. Israelson Utah Agr. Expo Sta Pro. 157 June 5, 1939." The binder had the Utah State Agricultural College seal. Box 4 contains unorganized an unlabeled images from various unidentified projects and trips relevant to O.W. Israelsen. The original order of the photos has been largely maintained, and the folder or envelope in which the photos arrived is clipped to the mylar sleeve. Most of these contain no information of value, and are included only as a matter of organizational reference. Box 5 contains a photo compilation book entitled "Irrigation Projects of Uzbekistan."