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Portneuf River Falls, Lava Hot Springs, Idaho
Just above the town of Lava Hot Springs in southern Idaho, the Portneuf River has a beautiful falls. The spring-fed river hosts luxuriant growths of watercress and other submerged macrophytes that thrive in the stable water temperatures. Lower down, agriculture and then effluents in the city of Pocatello add excessive nutrients and degrade the beautiful river.