are you allowed to ride atv's there?

There's other ATV trail heads near champmans dam (Clarendon area), buckaloons (Pleasant township area), Cherry Grove area, and some others in surrounding areas. Depends on what part of the ANF

There are atv trails. I would recommend stopping at Allegheny outfitters and getting a map.

There are trails in marienville and outside of bradford

Only trail I'm aware of is near marienville and it's through the forestry. None closer to me