Jeremy:
Here is what my notes say:
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5.16.06
Wanted to do Poison Spring Hill from BLM lands to NE, but ran into locked gates from that direction. Instead came in from N via CR D77, took this S until reaching a private elk farm. Used a fair BLM road around the E edge of the ranch, then turned right(S) on a barely driveable dirt track to a dead end next to fenceline, 2.5 miles N of the summit. Hiked S along a newer fence to point about .5 miles N of the HP. Easy walk from there. Found BM and reference mark. Back just after sunset. RT 5 miles, 2.5hrs 1000ft gain.
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Looking at the topo again, I recall parking here:
http://www.topozone.com/map.asp?lat=38. ... ayer=DRG25
A west approach from inside the NP might be another option. It must be insanely hot there now, best bet is to go early morning or evening.
-Tim