Oversize Sturgeon question

[magnus100]

Hello,
I am gonna be in Potland sept 19 and might drag my boat from spokane with to try and get into some oversize sturgeon. I fish below bonneville dam may June and July but have never tried it in late sept.  Are the big fish still around this time of year? I have vacuum packed shad so bait is no problem. Just looking for advice from some of you who live closer and fish the river a lot.
Thanks,
Mike

[syoungs]

Its pretty hot right now below mcnary, I reckon it is still good below boneville to.