1939: A round native timber tower with an L-4 observation cab constructed.
June 13, 1962: "McCart: Jerry Olson, Hamilton, who attends Hamilton High School. This is his first season with the Forest Service. He hopes to study forestry." (Ravalli Republic)
June 21, 1963: "Mr. and Mrs. Bill Zachry will spend their first season on McCart Lookout. Zachry is a Forestry student at Louisiana Poly at Ruston, La." (Ravalli Republic)
July 3, 1969: "Sandra Moore of Victor will be stationed on McCart Lookout. She is a student at Montana State University at Bozeman and has completed a year's study of pre-veterinary medicine." (Ravalli Republic)
1993: "1993 saw the completion of the more widely publicized lookout restoration projects in the region. Work was completed on McCart Lookout (Montana - Bitterroot NF), a 1939 L-4, and the lookout was put into the rental system, receiving extensive use." (Lookout Network, Vol. 4, Issue 4)