Sierra Interpretrve Association EASTERN SIERRA INTERPRETIVE ASSOCIATION Helping connect people to the public lands in the Eastern Sierra ESIA provides engaging interpretive programs and outstanding book stores up and down U.S. Highway 395 Official partner of: EST SERVICE u.s. NATIONAL PARK SERVICE TMENT OF AGRICU ESIAONLINE.ORG ESIA is located in the following Federal Agency Visitor Centers: Bishop, Bridgeport, Devils Postpile, Lee Vining, Lone Pine, Mammoth Lakes and Manzanar.