This was the first time I have actually saw one on the Po. A friend brought it to me to see if I knew what it was. Then again I am not much of a rock turner especially at this time of year, because I do not like getting my hands wet lol. I would say it was a size 14. My friend said he found a bunch when turning over rocks. I have noticed A LOT of vegitation growth towards the dam more. This is the first year I have noticed this occurring. Next time I am out I plan to take pictures of the growth to see if you guys can identify. Find it odd that all of a sudden this plant life is taking over. Almost every cast you are cleaning your fly. Hope this is good vegitation and not didymo.