I think I've pretty much finished the logic for the page itself.  I've rearranged things a bit, so that old link doesn't work anymore.  Here is a link for the new (final?) page that allows you to select the overlay map and also the base map.  For the time being, even though the '46 map is on the menu, it won't work - I'm still uploading the images.  As I georeference more maps, I will add them to the menu.  I doubt I will do all the images - only the better quality ones that show trails on them.  For example, I doubt I will do some of the district maps since they show very little detail as far as trails go.

Here is the link for the new page - I think the maps look a little closer in this one, although they are still skewed a little bit:

http://www.trailadvocate.org/maps/tiles/historicalMapOverlay.html

Feedback is welcome on this new design.

The 1946 map tiles have been uploaded and appear to be working now.

I added the 1931 maps last night.

I added the 1931 maps last night.

You are definitely on a roll!

I'm involved in finding routes through Newell Creek Canyon for a potential mountain bike route. The 1931 map extends into the now-urban area further west than the later overlays. Unlike the later ones show the Southern Pacific line extending directly into lower Oregon City. The right of way probably is not longer in existance but I will at least check that out.

So your efforts have proved usedful!

Thanks for letting me know.  I don't know how many of these maps I will geo-reference and tile.  It is very time consuming - I only want to do the ones that have enough detail that makes it useful to overlay.  I started working on the '72 map last night but something is messed up - the geo-referencing got all messed up.  I will have to revisit that one.  At any rate, I will be adding more overlays incrementally.

I kind of wish I could do the skyline trail maps, but there isn't much detail on those to be able to geo-reference (no lat/long coordinates or references).  I think it would be really interesting to overlay all the maps to see the routes over the years.