Completed my second SOTA activation on Black Crater on July 23, 2013. Black Creater trailhead is located just east of McKenzie Pass on OR 242.  The trailhead is well marked.  Parking and the trail are both very good.  Trail to the top is about four miles with about 3000ft elevation gain. Trail starts in dense forest and the forrest thins out as you go higher.  There were lots of bugs at the parking lot but once on the trail, they were not a problem.