The Stewart Mountain Dam is a concrete thin arch dam located 41 miles Northeast of Phoenix, Arizona. The dam is 1260 feet long, 208 feet high and was built between 1928-30. The dam includes a 13,000 kilowatt (kW) hydroelectric generating unit that operates primarily during the summer months. The dam forms the Saguaro reservoir as it slows the passage of the Salt River in Maricopa County, Arizona. It was named after a ranch that used to be located nearby known as the Old Stewart Ranch. dam stands for dekametre. ... Nickname Valley of the Sun Location Location in Maricopa County and the state of Arizona Government Country State Counties United States Arizona Maricopa Mayor Phil Gordon (D) Geographical characteristics Area - Total - Land - Water 1,230. ... The Salt River, a tributary of the Gila, is shown highlighted on a map of the United States and Mexico The Salt River (Oodham [Pima]: Onk Akimel) is a tributary of the Gila River, approximately 200 mi (322 km) long, in central Arizona in the United States. ... Maricopa County is located in the central part of the U.S. state of Arizona. ...