Here are fishing reports and information for the Potomac River region around Colonial Beach. The waters are Maryland property, so you'll see information here for the Southern Maryland area too. They're located right across the river from us, after all.
The area around the Morgantown Power Plant, near the Route 301 Harry W. Nice Bridge is listed as a fishing hot spot on the Maryland Department of Natural Resources website. http://www.dnr.state.md.us/fisheries/fishingreport/hot_spots.asp
Also, here's a link to current information and 30-day forecast.