Semi wall is the least climbed wall of Deception Crags and it's not because it doesn't have interesting routes. The reason - it's trail is superbly camouflaged.

To find the side trail to Semi wall, first find an old, but impressive, log/mud slide. The log slide is about a 7 minute hike from the Iron Horse trail turn off.

From here the side trail turn off is about 150 feet and to the right just past a creek crossing. It's a very faint trail: