Well I'm in FL but visit nw PA once in a while. There are some species I still need to find for sure up there..
I'd say where you saw a dor or one that has been killed is your best shot at finding another.
Everyone I talk to up there says they see the spotted adders in their garden or nearby where they may have placed those flat stones or logs. If you are finding red bellies and such, I'd think you are in the right area if you also add that to a close-by dor or killed milksnake.
Here's one from Warren county,PA

I may head up again this summer to find and photo another..
:Mark
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Surrender Dorothy!

crimsonking.piczo.com/

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