So I was just looking at the current map and the '38 map, looking around Alder Flat, and when browsing around the current map, I found a trail going south from Indian Henry down tothe Umpqua quarry? (across the river from the Raab campground).  The map shows it as trail 564, but that can't be right since that is the Rho Ridge trail.  This trail does show as a pretty long trail though

Link to google topo map

Is this a map error or is there really a trail down that side of the river?

Here is a map fragment: