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I can tell you it's as fun as it looks. Last year the Eugene Dive Club did a dive there, and then a few of us went back another day for a some more rides. The guy that introduced the club to this dives it from a kayak, although both times I was there we had a boat. At the north end of the lake you'll see a bunch of logs and other debris slowly swirling with the current- go to the east shore from there and follow the slope down. You should see the drop off marking where the tunnel comes into the lake. From there, just descend into the current and away you go. This obviosuly has some risks, so you should be an experienced diver, and should have a large enough group that others can watch to make sure you come out of the flow. Most people back kicked afterwards to get back to do it over again, but I snorkled through the log whirlpool to check out all the fish. Are you in the area? PM me if you'd like more info...
