Selah was incorporated on April 3, 1919. The government is a Strong Mayor/Council form. The Tree Top apple processor co-operative (established in 1960) has its headquarters and two processing plants in Selah. In 2004 the Yakama Tribe bought the old Hi-Country juicing plant, which it operated until 2010. Currently, the facility is owned and operated by Sun-Rype Products USA, the U.S. arm of Western Canada’s largest juice and fruit snack distributor. It continues to produce store brand apple juice and other beverages. In addition, a number of fruit companies have warehouses there, due to the proximity of fruit orchards in the nearby Wenas Valley and access to regional railroad and roadway systems for shipment to markets. Selah and the Wenas Valley increasingly serve as a “bedroom community” of the larger city of Yakima to the south. Because of the nearby orchards and juice processing plants, Selah is often referred to as “The Apple Juice Capital of the World”.
Wenas Creek flows from the reservoir through the agricultural lower Wenas Valley. This is where the Wenas Creek Mammoth was found.