A turn-out on left side of Hwy 70.  Enough space for 5 vehicles, I'd guess. On release weekends, you will see others there...otherwise it can be easy to miss.  You have to carry your boat across the street, over the guardrail, and down a somewhat steep cement embankment to the river.  The cement can be sharp, so rafters take care not to drag your boat here.

Alternate put-in just below the dam, down a steep trail.