1,495 black & white photographic images documenting Israelsen's long career in irrigation and drainage engineering (approximately 1900-1960). 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 may be from adjoining states and a few are from Italy, Spain, and Portugal.