I take that back, you may be hearing the Lynchburg site. On the KHB site most of what I hear is based around Washington, D.C., north to Philly and south to Charlottesville. However, they also give reports on the Shenandoah and Potomac Rivers.
I second on it being Lynchburg. I live in Chesterfield County VA and I can usually hear this station. When I listen it mention the same areas as you heard. Petersburg, the Appomatox and Rappahanock Rivers. If you hear it again, listen for the call sign.