There's an excellent post on fishing at Riverbend Park from a year or two ago. If you park at the Nature Center (not the visitor's center where the boat rentals are), then there's a connector trail (green blazes) leading from the "back" of the parking lot that connects to the Bootlegger's Trail (red blazes). There's a little lending library box at the head of the connector trail, with nature books and such. That connector trail hits Carper's Pond, and then goes down to the river. It's about a mile, a 20-minute walk, from the parking lot to the river. There's a spot right where the trail hits the river where you can wade a little bit. It is pretty obvious because it has a fishing line disposal bin right on the trail. I was hiking down there a week or two ago. The pond doesn't look like much, especially because it was carpeted in duckweed, but the wading spot at the river looked really nice. I didn't have a chance to fish it though, and I don't feel like shelling out the cash for a non-resident Maryland license to go back and give it a try.
Meredith