I took a wrong turning as we went over Stevens Pass and, instead of going where I had intended, we took a back road which was probably once the main road across the mountains. It twisted through the woods, never getting too far from the current highway, but being far more enclosed and far narrower. Fortunately, not much traffic was coming the other way, so it was easy enough to navigate. We crossed a small bridge which was over some falls. I can’t be sure but, judging by the map, the water seemed to be called Martin Creek so maybe the falls are of the same name?