This fun Class III scramble runs directly along the crest of the ridge that stretches between North Truchas Peak and its outrigger to the North, UN 12,900. It works in both directions. It is probably the shortest way to climb North Truchas, if one ascends UN 12,900 from Trampas Lakes. Alternatively, if one climbs North Truchas by another route, it makes a wonderful side trip culminating in terrific views of Las Trampas drainage and the Truchas Massif.
Getting ThereAscend UN 12,900 from Trampas Lakes, or ascend North Truchas Peak to do the route south to north.
Route DescriptionFrom UN 12,900, strike out due south along the ridge crest. You will run into two small craggy blocks, both of which can be dealt with by dropping a little to the right (west). In both cases, you should ascend back to the ridge crest as soon as is feasible. You will find a little bit of loose ground, and some Class II (maybe easy Class III) scrambling, but no major difficulties.
This trip report describes going "left around a blind corner... some sketchy traversing... narrow gully... loose, scary." That option looked wretched to me. I found a steep Class III trench (though it felt a bit more difficult on the descent) about 15 feet to the right of the ridge crest, marked by a small cairn. This trench heads straight up for 20 feet or so, then turns 90 degrees left and continues another 15 or 20 feet. This climbing definitely requires hands, and some people might call it Class IV; however, it does not feels exposed at all. The trench leads back to the ridge crest. Continue with another 20 feet or so of Class III scrambling, which is now significantly less steep but more exposed (there was some snow here when I came through, which made things a bit more nerve-wracking). The ridge soon mellows out until you can stand up and walk to the summit.
If you're coming the other direction, from N. Truchas to UN 12,900, just scramble down a little to the right (east) of the ridge crest until it starts steepening; then look for the sluicebox trench heading left and down.