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Here's a slideshow from Linn County's McDowell Creek Falls County Park, near Sweet Home, OR. The park's waterfalls have appeared here already:
I'm not sure if this area is technically part of the Cascades or not, but the moss-covered trees tell us the park gets a lot of precipitation. It's not quite as rainforesty as the Olympic Peninsula, say, but it still makes for some interesting photos. Or at least I thought they were interesting.