An andesite pinnacle of pretty good rock located a very short walk from highway 20. It has a few described routes, the most popular of which is the South Face route. The lower pitches are likely very mossy, but the sun-exposed upper pitches are pretty clean.
Olson's Northwest Oregon Rock also has some decent info, pictures, and topos of the handful of routes on Santiam Pinnacle and Gonzo Pinnacle immediately north.