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The Glendora Curve is the former colloquial name for the interchange between California State Route 57 and the Foothill Freeway, Interstate 210. The "curve" portion refers to the interchange from the northbound lanes of California State Route 57 to the westbound lanes of I-210, and from the eastbound lanes of I-210 to the southbound lanes of California State Route 57. The origin of the name comes from its location in the city of Glendora. Prior to 2002, this interchange was entirely part of I-210, and the eastern terminus of I-210 ended several miles south of the curve at the Kellogg Interchange at the junctions of the Chino Valley Freeway, California State Route 71, the San Bernardino Freeway, I-10, and Route 57. After the portion of I-210 south of the Glendora Curve was transferred to Route 57 in 2002, effectively extending Route 210 east past the Glendora Curve, the name Glendora Curve fell out of popular use.
