Little Falls Branch, or creek, can be found just north of Washington, DC. You can park in the small lot at the intersection of Massachusetts Ave NW and Little Falls Parkway. Then hike eastward and you will find spots where the water gets a few feet deep and is still, and you may find panfish and small bass in these spots. (To date, I’ve not landed a bass and so I can’t be sure if they are smallies or largemouths. I am guessing the former.)
The fish can spook easily as the water is crystal clear. A fly rod chucking a rubber version of the San Juan worm works very well. Or you can cast a meal worm or earth worm on a small hook (size 8 or less) with a small bobber a couple feet above the bait. (The water is shallow, but you need distance between the bobber and bait or the fish will be hesitant to bite.)