I am getting the fence for free. I get it from a buddy who has a fence business - it is all "take downs" that would otherwise go to the screap yard. I already have about 400' in place with about 300' to go.
I might try leaving some of the bank uncovered and available for turtles. If ther is too much mrat activity I can resort to other control measures.

Is it safe to assume the turtles (painted - thanks Norm) need the first 4' of bank same as the rats?

2/3 acre pond 12 miles from that big pond we call Lake Erie.