The first weekend of fall saw kayakers from northwest Montana, Idaho and several other western states running the whitewater of the Kootenai River falls.The adventuresome boaters shared the river with anglers seeking Kokanee salmon on a perfect sunny day as they ran several rapids and waterfalls above the river’s legendary swinging bridge.The smiles on their faces told spectators all they needed to know about their respective runs.The rapids range from Class I to IV. According to the U.S. Forest Service, the Kootenai Falls geology is composed of 1.5 billion-year-old quartzite and limestone rocks of the Belt Supergroup. The area offers impressive…