Is that the split to go to either potter creek or joe lake?

You sir, are at the landing of P290 to Woodcock Lake.  I've taken almost the exact same pic.

Did you happen to find the old campsite on Woodcock? Seems like it hasn't been used in many years (as of 2012 when I visited)

I doubt it was ever an 'official' campsite because, as you mentioned, it's not on Jeff's Map or the FoA map, nor was it indicated as a removed campsite on previous editions of Jeff's Map (I think v3 and prior showed removed campsites with a green 'x').
The site was nothing more than an old pit and tiny tent pad. East shore, approx 2/3rds up the lake. I tried to find the trail (or landing) to Little Woodcock Lake but was unsuccessful - granted I didn't try very hard.
The entire lake is very shallow, you can see the sandy bottom of the entire lake.