Despite the tenor of the previous post, most of our anniversary weekend was quite enjoyable, and full of mountain bike exploration. By far, the most interesting route was following an obscure trail out of Columbia that ran along side, or in some cases on, the Tuolumne Flume, then along an old rail grade, then on a series of little-known dirt roads heading north from Lyons Reservoir.
The next crossing was both much longer, and only had one board to walk on rather than two. Not the usual mountain biking terrain feature!
Route finding is left as an exercise for the reader, or bug Chad for the GPS trace.