To the OP, it is fine for a cyclist in Washington to take the lane in a traffic circle. I do it all the time. You don't have to use the bike lane at all if you can ride at or near the pace of traffic, which is easy to do in a traffic circle. You are generally obligated to stay as far right as you safely can if you can't keep pace with
traffic, but even then a traffic circle is a prime example of a place where it wouldn't be safe to stay to the right.