Arrowrock Dam, Idaho Basketball Team 1911
Photo from a postcard. 1911 written on the back of the card.
It's likely that this is a basketball team of workers on the Arrowrock Dam, whose construction began in 1911/12. (The dam was completed in 1915.)
According to wikipedia.org: "....The "work" camp [for the dam] offered amenities.... Not only was the site fully powered, but also it provided a central heating plant, running water and an efficient sewage system. Along with the Reclamation offices, the Arrowrock camp carried a hospital, mess hall, post office, and hotel. Workers and visitors were offered lodging in the site's hotel, bunkhouses, or cottages. In addition to the outdoor recreational activities, the camp also operated a YMCA., school, and dancehall. At the peak of construction, some 1,400 people had called Arrowrock home, including some 200 families."
Do you recognize any of these men?