American Whitewater says these are class IV-V rapids depending on the water flow cfs (cubic feet per second). Also some interesting history of the falls from the site:
This spectacular section of river formed 7000 years ago when the Lava Butte eruption buried the channel of the Deschutes River in more than 100 feet of lava creating a natural dam. Benham Falls was the outlet from the lake that formed; over time the river cut through the volcanic rock and the lake drained but some impressive whitewater remains.
And lastly a couple of blur motion shots of the water. The one on the left was hand held and the other one was with the camera set on a post using the remote shutter release. Okay results but I could clearly use some more practice and perhaps a tri-pod. 馃お
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