When I was growing up, we had a similar dewatering problem in 1987.

Some enterprising individuals seined and relocated quite a few juvenile salmonids to a lower reach of the creek where there was water to avoid total loss of the brood year.

I believe this was done without the knowledge of ODFW, but I don't think they were complaining when it happened either.

I normally don't condone bucket brigades but drastic times require drastic measures.