Hi Mark,<br> I've only been diving the river for
about 2 years now, so I've never seen visibility much
better than 10' between Marysville and St.Clair. I have
seen viz, over 20 feet while diving the Monarch which
is just below the bridge on the Canadian side, and
also near the bramble which is docked near the Pine
Grove park in Port Huron. Temps from May to July
typically range from a low in the mid to upper 50's and a
high in the upper 60's to low 70's. If you have any
other questions about the river you have come to the
right place. There are several club members who have
been diving the river since there was a river (maybe
not that long but you get the point)and we are always
eager to share information. If your looking for a buddy
drop a message in here and I am sure we can hook you
up.<br> Mike