Gradient, mile-by-mile: 160, 140, 160, 100, 100. See the description of a flow study, conducted 10/24/01, on Jason Rackley's excellent Oregon Kayaking site.
On 6/5/17, paddled from the confluence with Shellrock Creek 2 miles down to Harriet Lake (above this run). Much of this run is visible from the road or with a short walk into the woods. Very continous Class II, with a couple of Class IIIs at about 600 cfs outflow from Timothy Lake with only one mandatory portage in the first mile, followed by numerous portages in the last mile to the lake including a giant, difficult logjam. I highly recommend getting out after the bridge at the Harriet Lake cutoff. The continous gradient in the first mile makes for few eddies and should be approached with extreme caution.
Whitewater boating study of the Oak Grove Fork of the Clackamas.
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