Cornerstone Christian School (CCS) is a K-8th Grade School located in Lewiston, Idaho. Visit www.ccslewiston.com for more information. Cornerstone Christian School is a private Christian elementary school serving grades kindergarten through 8th with this mission: God has called us to raise and educate our children in a Christian environment while extending this opportunity to other families who may have similar desires. Therefore, our intention is to provide Christ centered education with challenging academics in a manner conducive to this calling.