1880: St. Mary's Hospital — the first of its kind in Arizona — opens, and is staffed by the Sisters of St. Joseph.

1909: The town of Wickenburg is incorporated by a vote of 36 to 5.

1919: An agreement is reached clearing the way for construction of the Florence diversion dam on the Gila River. The dam was expected to irrigate 62,000 acres of land in the Casa Grande Valley.

1995: Fire destroys most of Old Tucson Studios.

Want to share an important event from Tucson's history? Email it to krumore@azstarnet.com.