From the record
“Priestly's Hydraulic Ram, located in Gooding County, Idaho near Hagerman, Idaho, was a hydraulic ram invented and built c. 1890. It was used to move water uphill to irrigate agricultural land on the plateau above the Snake River.”
Wikipedia article Priestly's Hydraulic Ram, CC BY-SA 4.0.
One of 13 National Register listings published here for Gooding County · listed in 1975 · category: Structure · built in 1890.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service · the Wikipedia article