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.

Black and white photographs and negatives that document Winsor's career as an irrigation specialist and flood control researcher. Collectively, the photographs show the step-by-step construction of many dams and flood control barriers, and chronicle the changing machinery and technologies used to build dams from 1915 to the early 1940s.