Here's the Google Map for YW: [www.google.com]

The "Earth" view of the Yreka end of the line (not dated in the web view - loading into Google Earth or registering for a Google account might allow that information to be retrieved) seems to show some track gone, leaving a few cars isolated or nearly so south (west) of Center St. The street view (June 2012) shows quite a bit of equipment sitting around, especially near the water tank, but the (presumably more recent) Earth view doesn't show that.

Otherwise, the tracks still seem to be there, though in several spots there's so much dirt, junk, and overgrown vegetation that they're are hard to find.