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.

Eighteen images of the Willard, Utah flood of 1923 and the Parrish Creek flood of 1930 as well as erosion control efforts such as contouring. These images likely part of an exhibit or display.

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.