1. On August 22, 1924, a group of men led by Judge W.R. Chambers climbed to the summit of Humphreys Peak in Flagstaff, Arizona, and placed a brass marker to establish the exact elevation of the peak at 12,633 feet above sea level. Chambers, a prominent judge and member of the Arizona Pioneer Historical Society, was an avid hiker and outdoor enthusiast.

2. On August 22, 1936, the state of Arizona dedicated the Hoover Dam on the Colorado River near the border between Arizona and Nevada. The massive concrete structure, which was built during the Great Depression, provides hydroelectric power and serves as a major source of water for irrigation and municipal use in the southwestern United States.

3. August 22, 1978, marked the beginning of a major wildfire that burned for several days and destroyed over 175,000 acres of forest land in the Santa Rita Mountains south of Tucson. The fire, which was caused by lightning, was one of the largest in Arizona history at the time and resulted in the closure of several popular hiking and recreation areas.

4. August 22, 1994, was a significant day for the Arizona Cardinals football team, as it marked the unveiling of their new stadium in Tempe, Arizona. The stadium, which is now known as Sun Devil Stadium, has been the home of the Cardinals since 1988 and has hosted numerous professional and college football games, as well as other sporting and entertainment events.

5. On August 22, 2000, the citizens of Arizona voted in a referendum to establish English as the official language of the state. The measure, which was controversial and divisive, was designed to promote assimilation and discourage the use of other languages in official government documents and services. The law remains in effect today, although it has been challenged in court several times.