For those with 4WD, you can eliminate two miles of walking by driving up FR436 from the Blue Lakes CG and parking at about 11,660' at these coordinates: N 37° 17' 48.55" W 105° 08' 59.04". These are approximate at best. You can probably drive farther, but this area provided some good parking amidst trees and you wouldn't have to drive onto tundra to park out of the way. A little over a mile up from the campground, the road approaches a saddle at 11,380 ft. A trail that cuts south into the headwaters of the Purgatoire River goes off south from here. There's a good campsite at this location. Bearings are: N 37° 18' 01.09" W 105° 08' 19.60". We drove this 4WD track in 2000 in a Jeep Cherokee Sport with little or no difficulty. Some higher clearance passenger type vehicles may be able to manage this road.
If you don't have 4WD, you'll have to walk these two miles of road.
See information above.