Even though the federal government had opened this area of Montana to homesteading in 1862, not until 1909 did settlers really come into the Fairfield area when Congress liberalized this act allowing the settler 320 acres of free land instead of 160. It became apparent, however, that the small homesteads, 160 or 320 acres, made little sense in the vast and dry landscape of Montana. After the Bureau of Reclamation conducted a survey that showed a dam could be built in the Sun River Canyon and water for irrigation in Fairfield area would be feasible were many more settlers attracted to Fairfield. The Gibson Dam was completed in 1929. Today, Greenfield Irrigation District delivers water from Gibson Dam to approximately 83,000 acres surrounding this community.