Agua Fria was, from 1875 to 1876, a stagecoach stop situated in Maricopa County, Arizona, United States. It has an estimated elevation of 1,12…Agua Fria was, from 1875 to 1876, a stagecoach stop situated in Maricopa County, Arizona, United States. It has an estimated elevation of 1,122 feet above sea level. Today, Agua Fria is located in the city of El Mirage.