Answer the following question: Bighorn Ditch Headgate - The Bighorn Ditch Headgate also known as the Bighorn Canal Headgate was built starting in 1892 to provide irrigation to the Crow Indian Reservation in Montana. The headgate structure diverted water from the Bighorn River. It was designed by William F. Graves and construction was carried out by Crow laborers. The project was completed in 1904. Given a choice of categories company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, the text refers to which one?
Answer:
Building