Just use one of those "rated four times stronger than it's equivalent-diameter mono" fused lines like I do and bring the snag up off of the river bottom yourself. Or drop that annoying tree with the same stuff. If need be, take a portable come-along with you and tie the line off to the hook and start bringing that sucker up/down. Heck, you'll get likely up to a couple hundred dollars worth of tackle off of that snag so the time spent is worth it.

Just ask Hey Y`all how well I do with that. I've brought rocks up from the bottom of the bay to get my stuff back. Does require a hook resharpening, though, but getting it back is what is ultimately the most important.