I couldn’t quite get this down to species, but I’m sure it is from the genus Araneus. The colors were so handsome! There are about 650 species of Araneids – fairly common spiders.
This picture was taken in September of 2010, as I recall. The data are lost – arghhh., and I know it was at the Green Lane Reservoir in Red Hill, Pennsylvania, USA.
You can get some general information on these interesting spiders at: