The photos are by both Doug and me. Matterhorn Peak is a 12,200 foot peak
near Bridgeport off Hwy 395. It is in the Sawtooth Range, the most northern
"alpine-like" subrange in the Sierra Nevada. The Twin Lakes trailhead is
at 7,100 feet. The first two miles of the approach is on good trail and thereafter
is tough on increasingly indistinct climber's trail. This trip was a climb
of the North Arete (5.7). SuperTopo gives a lengthy description (http://www.supertopo.com/packs/highsierra.html).
The descent by the East Couloir is third class. A less difficult (though
still challenging) hiking ascent route is to continue all the way up Horse
Creek to Horse Creek Pass and then head west to the summit (this is second
class).