2017: The "A" on Sentinel Peak ("A" Mountain) is lit with flares signaling the start of University of Arizona Homecoming week in Tucson on Oct. 22, 2017. Members of the Bobcat Senior Honorary set up flares on the mountain as part of their tradition. The UA Alumni Association has a concise history of the "A":
Back-to-back victories over Pomona College in 1914 and 1915 inspired football player and civil engineering student Albert H. Condron. He went to one of his professors and suggested building an “A” in rocks on the side of Sentinel Peak as a class assignment.
Construction began on Nov. 13, 1915. It was completed on March 4, 1916.
The land was cleared and rocks were hauled up the mountain by six-horse teams. Students worked week after week and the “A” was finally white-washed nearly four months after construction began. Total cost of the project? $397.