Big Spring Creek is a 5.0-mile-long tributary of Conodoguinet Creek in Cumberland County, Pennsylvania in the United States. Big Spring Creek, the fifth largest spring in Pennsylvania with a median flow of 18 million US gallons/27 cfs a day, emerges near U.S. Route 11, approximately 8 miles northeast of Shippensburg, and feeds Conodoguinet Creek near New…Big Spring Creek is a 5.0-mile-long tributary of Conodoguinet Creek in Cumberland County, Pennsylvania in the United States. Big Spring Creek, the fifth largest spring in Pennsylvania with a median flow of 18 million US gallons/27 cfs a day, emerges near U.S. Route 11, approximately 8 miles northeast of Shippensburg, and feeds Conodoguinet Creek near Newville.