What we know
Joe (J. J.) Pettigrew's ranch, taken up in 1870: von Ahlefeldt has him coming from New York City that year, and Lavelett has his friend Patrick Murphy, already homesteading nearby, walk to Fort Bent to bring him (S-0009 pp. 26-27; S-0011 pp. 96-97). The library's record dates it to 1869 as a joint Murphy-Pettigrew homestead, the outlier; Murphy's own place is mapped separately. The survey found log cabins and a two-story house of about 1880, and a one-room schoolhouse that may have served Gwillimville (PPLD records of survey B35). In 1979 his Victorian ranch house, with a winding mahogany staircase, stood boarded up along Highway 83 'about a mile south of Pat Murphy's homestead', with a 'hanging tree' on the ranch. He gave the land for the Gwillimville church of 1893 (von Ahlefeldt pp. 26-27, 45).
Where it was
'Three miles south of East Palmer Divide Avenue along Highway 83' (PPLD records of survey photos B35), measured along Highway 83 in OpenStreetMap; the 1987 Black Forest Preservation Plan's Map 2 No. 3 sits at the same point. Side of the road assumed. Good to about a quarter mile.
Placed from a written description, such as a land section, a distance from a landmark or an old survey note.
Sources
Sources are named in the text above. Numbers such as S-0080 refer to our source list. Most newspaper quotations were read in the Colorado Historic Newspapers Collection. Long quotations from recent books are shortened here.