Making a guess reading the article, I'd say near Clear Lake, possibly as far south as Waldo lake and as far north as Breitenbush hotsprings. Although it looks l

Making a guess reading the article, I'd say near Clear Lake, possibly as far south as Waldo lake and as far north as Breitenbush hotsprings. Although it looks like the claim is that similar amounts of water could be found under other regions in the Cascades. Both lakes are very deep and impressively clear, Clear lake has trees at the bottom that were killed in the creation of the lake when the volcano nearby erupted relatively recently.