Ephrata Municipal Airport is a public use airport located 4km southeast of the central business district of Ephrata, a city in Grant County, Washington, United States. It is included in the National Plan of Integrated Airport Systems for 2011–2015, which categorized it as a general aviation airport.HistoryThe airfield was established in 1939 as Ephrata Army Air Base. It was used initially as a support airfield for bombing and gunnery ranges in the area (Seven Mile Gunnery School). Transferred to Fourth Air Force in 1940 as a group training airfield for B-17 Flying Fortress heavy bombardment units (including the 401st Bombardment Group), with new aircraft being obtained from Boeing near Seattle. Later it was reassigned to Second Air Force when heavy bombardment group training was reassigned to that command. It was also used by Air Technical Service Command as an aircraft maintenance and supply depot. The facility closed in late 1945 and was turned over to War Assets Administration (WAA) for disposal. It was transferred to Grant County and developed into a commercial airport in the late 1940s.