You shouldn't have to get your feet wet if you step carefully. It is not above or in the water. That said, when the skunk cabbage is in full swing it may be difficult to see where you're stepping. Be prepared to wade through a bit of greenery, some of it with thorns, though you should be able to avoid most of the latter.
Remember that you share this space with other wild critters. Saw evidence of several types of wildlife while placing the cache.