Ann Coneross Creek crosses the old US 123 in Richland, Oconee Co, SC. If you are traveling toward Seneca from Westminster, it is before the Rail Road underpass. I don't think that it is back waters of Lake Heartwell at that point. The map site that someone told you about did not work for me. It did not recognize Coneross Creek. As I knew it was I also put in Richland, Oconee County, and got map of area and Coneross Creek was on it but not labeled. Good Luck George Riverdale, GA (formally of Westminster)