History and Formation
The history of Sabino Canyon began with the formation of the Santa Catalina Mountains over 12 million years ago. Around 5 million B.C., the mountains ceased formation around the Tucson valley. Present-day varieties of plant life first appeared between 6,000 and 8,000 years ago, and some of the earliest human occupants of Sabino Canyon were the Native American Hohokam people.
An earthquake centered in northern Mexico in 1887 dislodged massive boulders lining the canyon walls, which came to rest in the valley below. In 1905 the newly created U.S. Forest Service began administering Sabino Canyon. During the Great Depression, the Works Progress Administration (WPA) and Emergency Relief Administration (ERA) built Sabino Dam and nine bridges over Sabino Creek in an attempt to build a road to the top of Mount Lemmon. The road travels about 4.5 miles into the canyon, but was not completed due to the steep terrain at the end of the canyon.
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