Did Old Mt. Si trail after work Wednesday, 4/11. If the regular Mt. Si trail gives you a good ""work out"", double it for this one. It is almost continually steep, average 30 % grade, with only a couple of momentary flat spots. One place in particular has 60% grade for about 100 ft.
Start on Little Si trail, climb first steep hill. The Little Si trail flattens out, take the 3rd right by the sign that points ""Little Si"" to the left. From there it is all uphill. Starting elev 480 ft, so have 200 ft more elev gain than regular trail. Trail is rockier, ""falling away"" in spots. Encountered 3-6"" fresh snow after 2500 ft. Made for slippery trail coming down. Used 4 point, instep crampons and walking sticks.
Old trail comes w/in 10 ft of new trail, just past the 3 mi point on the new trail. Old trail tops out just before first view point. On return watch for your right turn onto the old trail, its easy to just run past it.
Its a great conditioner trip, 3500 elev gain. Trail has a more ""isolated"" feeling, it's ""softer"" on the feet.
Distance is about the same, 4 mi, time was also about the same, 2hr up.