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Watershed boundary map: caltopo.com/map.html#ll=40.…
This is a traverse of Audubon and all the named peaks on the continental divide between Paiute and South Arapaho Peak. There's lots of Class 3 scrambling, some Class 4, and one or two short 5.0-5.4 sections. The distance is about 17 miles with 8,500' elevation gain. It's been done in under 7 hours, but most people will take much longer.
A variation that avoids a shuttle back to the start is the Brainard Basin Traverse. See 7a below.
1. Start at Mitchell Lake trailhead, and hike up the trail to Audubon.
2. Hike across to Pauite's east ridge, and scramble up the ridge.
3. Hike down to the base of Mt. Toll. In mid-August 2018 we found a small pool of meltwater here, one of the few water sources at that time of year. Climb Toll's north "ridge" (really the NW face), Class 4 with a 20' 5.4 corner. See Buzz Burrell's comment under https://www.mountainproject.com/route/105758278/north-ridge and https://www.mountainproject.com/photo/114957967. Or traverse south at the base of the face, and climb a gully on the west side (loose 3rd class).
4. Hike down from Toll and up to Pawnee Peak. In early September 2022 there were a few pools of water at the saddle between Toll and Pawnee.
5. Hike across the Pawnee Pass to Shoshoni Peak.
6. Traverse from Shoshoni to the start of the "Chessmen", https://www.mountainproject.com/route/105764475/kasparov-traverse. Most of the towers can by bypassed by Class 3 and 4 scrambling on exposed ledges, initially on the west side and then crossing over to the east at the base of the first major tower (the White Knight). Once on the east side, a gradually descending traverse leads to a notch with a good view of the Rook and the Bishop's Scepter. Stay on the east side and make an ascending traverse to a notch between the King's Pawn and the King. Try to stay high; if you traverse too low you'll end up in an ugly, loose gully below the notch. The elevation at the notch is about 12,900'. Once at the notch, climb the King via the ridge crest and ramps on the east side (Class 3). Scramble to the summit of Apache.
7. Hike SE and downclimb (exposed Class 3) towards Navajo. Bypass "Dicker's Peck," and follow a ramp across the SW side of Navajo until a deep west-facing gully comes into view. Climb the gully (Class 4) to the base of a short, steep cliff band. Traverse south on an easy ledge, then double back and follow Navajo's SW ridge for a short distance to the top. Reverse the last section to descend.
7a. From Navajo, a variation that returns to Mitchell Lake trailhead is to head east on Niwot Ridge. This provides almost 3/4 mile of Class 3 scrambling before the ridge turns into a broad, grassy shoulder. Once on the shoulder, pass a weather station (Point 12,284 on USGS maps), pick up a rough jeep track and follow it east for about 2 miles before turning north onto the USFS Niwot Ridge trail. Follow the trail down to Long Lake and the trailhead. Part of the jeep track crosses into the City of Boulder watershed, but presumably Boulder's okay with that, since their "no trespassing" signs are all to the south of the track.
8. If continuing to South Arapaho Peak, hike down scree from Navajo to a tarn at the base of a snowfield on the NE side of the Navajo-Arikaree col. This is a good water spot and the only place where the route deviates by more than a few hundred feet from the ridge crest. (Ironically, the snowfield appears to be partially outside the City of Boulder watershed, even though it drains to the east). Scramble up the north ridge of Arikaree or ledges on the ridge's east side.
Alternatively, it's possible to descend the ridge crest until the low point between Navajo and Arikaree. This is considerably more difficult. Tommy Caldwell did it this way in August 2020.
9. Hike down from Arikaree and across a flat section, then up and over Point 12,887, until the ridge narrows. Follow the ridge crest for several hundred feet to a notch. At this point there is an old airplane wreck. According to https://planecrashmap.com/plane/co/N609Z and https://aviation-safety.net/database/record.php?id=19631207-0, these are the remains of a Curtis C46 cargo plane that crashed in December 1963. Climb gingerly past the wreckage and up a corner (Class 4). Follow ledges on the E side just below the ridge crest and drop down to a notch at the base of the north ridge of "Deshawa" (unmarked on USGS maps). Alternatively, from the notch near the wreckage, downclimb (loose Class 3) towards a small tower, traverse south along ledges at the base of steep cliffs, then climb up to the notch below "Deshawa". The latter variation may be covered by snow until late summer. Either way, once at the notch below "Deshawa", climb a short 5.0 corner near the ridge crest then a Class 3 ramp on the east side to the summit.
10. Scramble across to the base of the NE ridge of North Arapaho Peak. Where the ridge steepens, climb Class 4 slabs on the right side of the ridge crest, move back left to the ridge crest, bypass a short vertical step (very exposed), then move back right, and climb more slabs to regain the ridge crest where the angle eases off. Follow a long Class 3 ramp on the east side until one can cross over easily to the west. Hike a few hundred feet up scree slopes to the summit.
11. Follow the well-trodden Class 3 traverse to South Arapaho Peak, https://www.mountainproject.com/route/105756721/south-ridge. Run, walk, or hobble down the trail to the 4th of July trailhead.
GPX track: https://caltopo.com/m/RAVVS.
Anton Krupicka's trip report: http://antonkrupicka.com/blog/audubon-to-arapaho/.