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Lake is currently 654 so the River Channel will be around 140.
Jut an FYI but the viz is really crappy deep at the moment. Something like 1 foot at 100 feet
Now look what you've done. You gone and discouraged him. A TRUE swamper would say "Viz is really incredible deep at the moment. Something like 1 foot at 100 feet."
Phrase it that way and you'll have to beat them back with a stick!
In retrospect I may have been being unduly pessimistic.
Viz is probably somewhere in the 12-13" range.