Not that familiar with the stretch, but I've heard of access off Dowans Cr Rd that goes up the south side of the upper Bogey.
I guess my question would be though, why bother? Even if you drop in at the Bogachiel State Park it's still about a 9 mile float down to the hatchery.
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Matt. 8:27   The men were amazed and asked, “What kind of man is this? Even the winds and the waves obey him!”