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Jim, a Google search on St. Clair River currents brought me to the Coast
Pilot at the below address which is excerpted below.
http://www.oakland.edu/boatnerd/facts&figures/strivcp.htm

5) Currents,St. Clair River.-The following currents are based on averages of
water flow through through the entire cross section of the river, that is
from bank to bank and from surface to bottom during normal flow conditions.
Normal flow conditions are encountered when there is no wind, Lake Huron is
at a stage of 578.9 feet (176.4 meters) and Lake St. Clair is at a stage of
573.9 feet (174.9 meters) above the mean water level at Rimouski, Quebec, on
the International Great Lakes Datum 1985 (IGLD 1985), that is 1.4 feet (0.4
meter) and 1.6 feet (0.5 meter) above their respective Low Water Datums. The
current encountered at midstream is usually about 1.5 times the average
velocity. Greater Velocities may be expected when the difference between
lake levels is greater, or the lake stages higher.

(6) Currents for the following locations in the St. Clair River are given at
high water flow of 230,000 cubic feet per second (cfs), medium water flow of
188,000 cfs, and low water flow of 130,000 cfs, respectively.
(7) Algonac: 2.0 mph, 1.6 mph, and 1.3 mph.
(8) Port Lambton: 2.0 mph, 1.7 mph, and 1.3 mph.
(9) Marine City: 2.0 mph, 1.6 mph, and 1.3 mph.
(10) St. Clair: 2.1 mph, 1.8 mph, and 1.4 mph.
(11) Marysville: 1.9 mph, 1.6 mph, and 1.3 mph.
(12) Point Edward: 3.9 mph, 3.3mph, and 2.5 mph.

(13) The rapids section extends from about 1,00 feet above to 200 or 300
feet below the Blue Water Bridge. During peroiods of sustained high N to NE
winds on Lake Huron, velocities in the upper St. Clair River are increased.



Martin Lutz


----- Original Message -----
From: "Jim Cobb" <Cobber@ci*.co*>
To: "Thom Hadfield" <thom.hadfield@ho*.co*>; <techdiver@aquanaut.com>
Sent: Tuesday, July 31, 2001 6:27 PM
Subject: Re: On high current diving


> Dearest Thom-
>
> I neither believe nor disbelieve your 7 knot currents. I guess I'd say I'd
have to see it to believe it.
 >


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