You have to go north as well....(NE actually).  It is a river, it is a fork of a river.  That is a lot of clues....

Would this wilderness trail that follows a fork of a river be in one of the new wilderness areas or an addition to an existing wilderness?

It never said it follows the fork of a river, just that a fork of a river appears in that photo.

And yes, the trail is in a new wilderness area, not an extension of an existing area.

Rob:

Is that the South Fork Clack, at the bottom of Hillock Burn Trail?

Zack Byerly said:

Rob:

Is that the South Fork Clack, at the bottom of Hillock Burn Trail?

You are correct.  Your turn to post a photo!