This weekend might be tough to actually find fish, based on the rise:
http://www.nwrfc.noaa.gov/river/station/flowplot/flowplot.cgi?ESTO3
I would imagine that most, or all, of the coho would have bolted from their spots by now, since they've been holding for higher water for some time.
On a rising river, this time of year, it will probably also be tough to find summers that probably move around in the shifting conditions, even though they're prone to still be around for some months.
The Clack fishes best at 12 feet or below, so by 11/2, it might be a bit easier, but many fish will have likely shifted around, so one just has to find them. However, 13 feet this weekend is not impossible, coho are probably higher up and motoring and some summers might be around, but changed locations in the higher current, and who know if in the biting mood given the drastic change in conditions.
Only way to find out is give it a try.