After frustrating searches looking for the history of Catherine (Kath-r-ine) Pass near Bay City WI, I sent an email to the Pierce County Historical Association.
At one time there was a Big and Little Catherine although the Little Catherine filled in many years ago. Big Catherine is very shallow at this time too.
They were used as short cuts to Red Wing, the WI Back Channel and Goose Lake.
As far as how they were named Francisco, the folks at the Association couldn’t find any reference or people still around to give us an answer.
This info was obtained from Lee Miller of Bay City WI.