Note: We climbed T.11 on a day that included Three Needles first, T.11 next, then was followed by UN13,159. The total miles and elevation gain provided reflect climbing all three peaks. The actual distance from Three Needles to T.11 is about 1.25 miles with 800 feet of additional gain. This route description begins from the summit of Three Needles.
From the summit of Three Needles, head back down the west side of the south ridge per our description for Three Needles, and return to the notch that allowed access to the south ridge from Porphyry Lake and Basin. If you attempt to proceed further along the ridge crest, there will be a difficult notch followed by a traverse of spires and other obstacles all the way to Pt.13,375. "Furthermore" on LoJ, describes descending on the east side of the ridge to drop below the rough section, then regaining the ridge beyond Pt.13,375 to continue on to T.11.
As for us, from the notch where we first gained the south ridge, we began dropping straight to the west, following down one shallow gully until we were forced further south to seek a route through a sloping cliff band. we located a place to cut through the cliff and as it turned out, this may have been the only safe place for some distance. Once through the cliff band, it was still more descending for several hundred feet to a rocky bench area at about 12,700 ft. All of this descending was on very steep and extremely loose and treacherous talus. Elevation loss was at least 600 feet.
Once on the bench, head south over large boulders that will give way to tundra. In earlier season, there may be some snow to negotiate. Cross the easy East Basin bench and begin your ascent to the low point of the connecting ridge between T.11 and Pt.13,434 to the east. there will be one steeper ascent place at about 12,800 ft. Stroll across another higher bench and make the final short climb to the east ridge. The section of ridge from the low point to the east will have some spectacular gendarmes, but heading west, you'll encounter no difficulties other than the boulders you'll have to scramble over. Once on the summit, make your decision as to whether or not to include UN13,159 in your day or begin your return hike to Red Mountain Pass or wherever you left your vehicle.
If returning from T.11 to the start, we suggest heading down the south ridge of T.11, and then dropping down some into the vast Mill Creek Basin. Contour east around Pt.13,228 and north into another basin below Pt.13,375. Contour yet again, at about 12,600 - 800 feet to the east around another protruding ridge and back into Porphyry Basin where you can rejoin your access route from the morning. This is all just Class 2 hiking over varied terrain that includes one rock glacier to cross, some splendid wildflowers and tundra.