From the record
“The Old Settler's Irrigation Ditch, near Rosston, Oklahoma, in both Beaver County, Oklahoma and Harper County, Oklahoma, was constructed during 1893 to 1905. It was listed on the National Register of Historic Places listings in Beaver County, Oklahoma in 1983.”
Wikipedia article Old Settler's Irrigation Ditch, CC BY-SA 4.0.
One of 13 National Register listings published here for Harper County · listed in 1983 · category: Site · built in 1905.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service · the Wikipedia article