The eldest son, Robert Harrison Callahan, and his wife, Josephine Kuhn, took up land west of the senior Callahans (western half of Section 9, T1N, R12E) sometime prior to 1881, probably shortly after their marriage in 1877. In 1887, their assessment noted a house, a barn, and a fence on the southern half of the northwest quarter and north half of the southwestern quarter, on land originally patented by William M. Toomey in 1874.
In 1887, Robert was assessed for a house, a barn, and a fence on the property, as well as personal property including a watch, furniture, a guitar, a sewing machine, farming utensils, a buckboard, a harness, three horses, two colts, two cows, two stock cattle, 265 sheep, 110 lambs, poultry, hogs, and a dog. In later years, Charlie Stone described this as the residence of Robert Callahan, as located on the west side of Littlejohns Creek near the mine waste rock dump. In 1889, Robert Callahan sold this parcel of more than 92 acres of his lands to Nathan Flower 1.
As well as the lands in the western half of Section 9, Robert had acquired land to the east (southeastern quarter of Section 9, T1N, R12E), patented by Robert McCoun in 1882. McCoun, noted as a 48-year-old blind musician residing at the Tower Ranch in 1880, evidently was the brother of Elvira Callahan and simply patented the land for them. He also patented the northeastern quarter of Section 15, T1N, R12E, in 1890, presumably also for the Callahans.
In 1900, the census enumerator listed Robert Callahan as a farmer owning his mortgaged farm. He was age 45, and his wife, Josephine, was 42 and keeping house; his daughter, Susie, was 21 and a servant; and his son, Charles, was 14 and at school. His brother Austin was boarding at the Gorham Ranch and working as a day laborer.
By 1910, the Callahan family was still residing on its farm, with Robert noted as a farmer and the children with no occupation. Boarding with them were musician Isaac McCafferty, from Wisconsin, and John Olson, a woodchopper from Sweden. Sometime before 1920, Robert’s son, Charles, married Delia Gorham and moved to the Gorham Ranch (east of the project area) and was working as a truck driver in a copper mine, while Delia was teaching.
In 1930, Robert Callahan was still listed as a stock raiser, age 77, and residing with his wife and daughter, Susie, on their farm. The Robert Callahan Ranch finally was sold to the Flower family in the 1930s (Stone 1992).