When I was growing up in Monmouth county, there was a section of woods about 100 acres, more or less, behind my house. I spent a great deal of time back there. In the deepest spot there were these swamp maples. We would go back there and find these monster black rat snakes. They were always in the trees, often hugging the trunks and/or climbing the canopy. It was dark in there and I guess they were going up for sun or bird eggs or both. Anyway, they were monsters. I caught only a few of those 'cause they were always up so high. The ones I caught measure 6' to a little over 6'. I recall one being 6'4" but I could be wrong. Anyway, those wern't the biggest of the bunch so I don't know how large they got. I have never seen such a large concentration of black rat snakes, or any even close to the size of those things. They had girth also, as big around as the saplings they were climbing.
Sadly, that spot is now under pavement.
Jeff