The (three degrees by five degrees) area I am mapping now is almost more than a PC (and I) can handle (at the high level of detail at which I'm working) -- and I've had no cause to work that far north and west...yet...
Sounds like a fascinating place, though. In fact, I couldn't resist taking a peek and "ghosting in" a couple of possible candidate traces crossing the canyon. (Too bad the photo was made at midday in the summer (almost no shadows). A winter shot would have made those traces out across the plowed field to the west of the airporrt runway really stand out... (Of course, if I'd been really serious about this, I would have developed a custom "grad" filter to enhance the visibility...)
I highlighted the most likely trail in pale (almost too pale) yellow, and another (toward the botom) in pink. I also tinted in (in purple) an old railroad grade that ran through the canyon... If I were actually mapping the area, I would consider this just clues as to where to look (and walk with the GPS receiver in hand) when I actually got on site...
If you would like to see the unmodified aerial photo, it is on Terraserver. By clicking on the tab at the top of the page, you can also get a topo map -- but I'd suggest zooming out a bit, because the Terraserver topo maps at this high magnification are prettty ragged.
FYI, I located the site (and got the targeted link to Terraserver) using USGNIS (The USGS's Geographic Names Information System) -- and that's also where I got the little inset map (with the "red dot marks the spot") from the Census Bureau's "Tiger" Server.
FWIW, I normally wouldn't have put this much effort into a mere FR response but I was 'exercising' a new rev of Canvas, my "workhorse" graphics/GIS software. And, besides, fellow ex-USAF troops deserve a little special consideration... '-)
(WayneM, I hope this gives you some "starting points", too...)