Trashed Creek

I spent this morning cutting vines off the huge Nobel Fir in my yard. This process led me to the over-grown section of the storm-runoff creek that comes down the mountain and passes beside my cabin, down to Little Branch, and finally down to the mighty French Broad River.
It seems that the previous owners felt a trip to the dump was too big a hassle when there's a perfectly good creek to trash on your property.
So today I started clearing vines and found the remnants of old metal chairs, other odd pieces of metal, rocks and mortar from what appeared to be a building foundation, fabric, foam cushions, and plastic and metal pipes (perhaps they thought the water would pass through them and go under the trash).
The pile of trash in this photo, I'm sure, is just the tip of the Mt. Trashmore.
It got me thinking, are there any environmental organizations that could help me with a stream clean-up/restoration project?