text: Legally you might be able to get this far up (walking up the stream bed), but whether it's physically accessible much further is likely to be a different question.  Just to the southwest is "The Inaccessible Pinnacle" so I suspect that might be difficult :)
  
  I'd suggest using local mountaineering sources rather than general-purpose map data like OSM, especially as some of the data here is clearly traced rather than surveyed (streams from NPE, for example).