Summit Township, Clay County, IowaSummit Township is a township in Clay County, Iowa, USA. As of the 2000 census, its population was 452. Spencer Municipal Airport is located in the township.HistorySummit Township was created in 1872.GeographySummit Township covers an area of and contains one incorporated settlement, Fostoria. According to the USGS, it contains one cemetery, Evergreen.EconomyAt one point Great Lakes Airlines was headquartered in the township.