Stlhdr2,
The best spot totally depends on water level in my experience. I fish mainly the upper 1/2 of the lower Clack. All bank access points and parks have at least some good water nearby. Just too bad there's not any more bank access than there is. McIver has the most access and I catch fish all through there. More crowded up by the dam and at Dog creek, but then there's more fish there too. You can also access the bank below the dam on the east side at Rivermill park. That was closed this time last year, but I think it may have reopened. Amato publications makes a good fishing map of the Clackamas that shows locations of access points. Some, I haven't yet checked out yet.
Later!
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If every fisherman would pick up one piece of trash, we'd have cleaner rivers and more access.