I'd advise you to use the PFBC natural reproduction list and start exploring. There are limited wild trout opportunities in Erie County and a modest amount more in Crawford County. Your major impediments are going to be: access and fishability (fishability meaning stream size, brushiness, swamps, etc.). Probably 90% of the wild trout opportunities are going to be over browns. Almost all of the streams worth exploring are going to be in the eastern halves of both counties. One clue, in Erie County at least, is that a major property rights dispute in the 80's and 90's caused half or more of the stocked inland streams in the county to be posted and removed from stocking. In the interim, some pretty decent wild trout pops. have developed both in portions of the main stream as well as some of the tribs in some (but not all..) of these watersheds. With the right approach in asking permission, it may be possible to access some of this water.
Just as a generality, the best of the Crawford County wild trout fishery is in smaller streams in the Oil Creek and Sugar Creek watersheds. Access is where you can find it, but will probably be a little better than Erie County.
There's something, anyway...🙂
Match some of this up with the NR and you have a start..
Good Luck!