I know exactly where the poster in the "south" thread was crabbing. However, I wont totally burn a guys spot. What I will say is "Choptank" or any of it's tributaries. Shallow, 3-7' near the grasses. Now go find them, they are there.
There are three Dorchester co. public ramps on the Chop that are free and you don't need a permit. Great Marsh has the most parking. The hospital is another and Cambridge Creek is the third.