Sorry, I missed the part of the question about how to fish it, wouldn't have given you a two word answer. Afish nailed it on the head, if I'm hitting the skinny water it will be with a dry dropper 8 or 9 months out of the year. During the winter I will be tight line nymphing the slow skinny water. Often you will see fish warming themselves in water so shallow most people skip out of habit. To answer your second question, yes a shallow riffle is still considered skinny, however, in the cold temps I'm not looking to fish water moving that quick.