The Yellow Cliffs ramp near SB Cove is closest official launch point that would allow you to get to cat bay and upstream to no wake buoys. So as you are heading down Bartlett Dam road near the end you'll see a left turn to Yellow Cliffs or SB Cove and you'll take that the entire way until it ends. Some folks just dock with 4-wheel drive on the dirt but that's at your own experience.