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The Bihedral Area

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Bihedral (Upper Tier), The 
Castaway Block 
Left Side, The 
Lower Tier, The 
Riviera, The 

The Bihedral Area Rock Climbing 


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Elevation: 6,850'
Location: 40.0034, -105.3969 View Map  Incorrect?
Page Views: 95,297
Administrators: Leo Paik, John McNamee, Frances Fierst, Monty, Monomaniac, Kristine Hoffman (sitewide)
Submitted By: Kreighton Bieger on Sep 13, 2006
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BETA PHOTO: The correct entry trailhead.

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  • Description 

    The Bihedral Area includes at least 4 sub-areas: The Bihedral, The Riviera, the Left Side and The Lower Tier. For organizational purposes, this is subdivided here. This photo may help.

    The Bihedral Area rock is typical Boulder Canyon granite climbing. Generally less than vertical on bullet hard grey granite. Good friction with a high concentration of slopers, both large and small, and positive incut edges. The Bihedral crag itself is identified by a huge, left-facing dihedral and sits on the north side of the canyon. The dihedral is split by a prow about 1/2 way up. The Riviera is located down & right of The Bihedral. The Left Side is located to the left of The Bihedral. The Lower Tier is located below the The Bihedral (Upper Tier) upper tier.

    Getting There 

    Drive 7 miles up the canyon (zero at the bridge a la Rossiter), park just past the Riviera at a pullout on the right, or there is shady parking on the left side identified by a west-facing "No Camping" sign nailed to a tree. The huge, left-facing dihedral of the Bihedral is obvious above you. Cross the road, walk down a bit and pick a line up a boulder field and scoot left around a short broken buttress. 4th class it up past some trees on your right and gain a nice ledge at the bottom of the big dihedral. There are a few good routes here, but the most well known is the 2 pitch Bihedral Arete, which Rossiter so obtusely refers to as "something of a classic".

    Climbing Season



    Weather station 4.4 miles from here

    82 Total Climbing Routes

    ['4 Stars',0],['3 Stars',6],['2 Stars',54],['1 Star',21],['Bomb',1]
    ['<=5.6',2],['5.7',8],['5.8',16],['5.9',19],['5.10',19],['5.11',15],['5.12',2],['5.13',0],['>=5.14',0],['',0],['<=V1',1],['V2-3',0],['V4-5',0],['V6-7',0],['V8-9',0],['V10-11',0],['V12-13',0],['>=V14',0]

    Classic Climbing Routes in The Bihedral Area

    Mountain Project's determination of the classic, most popular, highest rated climbing routes for The Bihedral Area:
    Chouette   5.6 4c 14 V 12 S 4b     Trad, Sport, 1 pitch, 90'   The Riviera
    Sun Spot   5.7 5a 15 V+ 13 MVS 4b     Trad, Sport, 1 pitch, 100'   The Bihedral (Upper Tier)
    It's Time For Change   5.8 5b 16 VI- 15 HVS 4c     Trad, Sport, 1 pitch, 90'   The Bihedral (Upper Tier)
    Trick or Treat   5.8 5b 16 VI- 15 HVS 4c     Trad, Sport, 1 pitch, 100'   The Bihedral (Upper Tier)
    Dan's Line   5.8 5b 16 VI- 15 HVS 4c     Sport, 1 pitch, 100'   The Bihedral (Upper Tier)
    Topless Etiquette   5.8 5b 16 VI- 15 HVS 4c     Sport, 1 pitch, 85'   The Riviera
    Bihedral   5.8+ 5b 16 VI- 15 HVS 4c PG13     Trad, 2 pitches   The Bihedral (Upper Tier)
    Hold The Line   5.9 5c 17 VI 17 HVS 5a     Sport, 1 pitch, 100'   The Bihedral (Upper Tier)
    Devin's Dihedral   5.9+ 5c 17 VI 17 E1 5a R     Trad, Sport, TR, 1 pitch, 60'   The Riviera
    Bihedral Arete   5.10a 6a 18 VI+ 18 E1 5a     Trad, Sport, 2 pitches, 180'   The Bihedral (Upper Tier)
    Flags of Our Fathers   5.10a 6a 18 VI+ 18 E1 5a     Trad, Sport, 3 pitches, 200'   The Bihedral (Upper Tier)
    Puff Daddy   5.10a 6a 18 VI+ 18 E1 5a     Sport, 1 pitch, 65'   The Bihedral (Upper Tier)
    Hound's Tooth   5.10a 6a 18 VI+ 18 E1 5a     Sport, 1 pitch, 80'   The Lower Tier
    Daydreaming   5.10- 6a 18 VI+ 18 E1 5a     Trad, 1 pitch, 40'   The Bihedral (Upper Tier)
    Rhodian Shores   5.10b 6a+ 19 VII- 19 E2 5b     Sport, 1 pitch, 100'   The Bihedral (Upper Tier)
    Le Nouveau Riche   5.10b/c 6b 20 VII 20 E2 5b PG13     Trad, Sport, TR, 1 pitch, 85'   The Riviera
    Sea Breeze   5.11a 6c 22 VII+ 22 E3 5c     Sport, 1 pitch, 60'   The Riviera
    Blood Diamond   5.11c 6c+ 24 VIII- 24 E4 6a     Sport, 1 pitch, 80'   The Bihedral (Upper Tier)
    Sands of Iwo Jima   5.11d 7a 24 VIII 25 E5 6a     Sport, 1 pitch, 50'   The Bihedral (Upper Tier)
    Thumb Tack   5.11d 7a 24 VIII 25 E5 6a     Trad, 1 pitch, 60'   The Bihedral (Upper Tier)
    Browse More Rock Climbing Classics in The Bihedral Area

    Featured Route For The Bihedral Area
    Rock Climbing Photo: Tony Bubb arrives at the steep section of 'Thumb T...

    Thumb Tack 5.11d 7a 24 VIII 25 E5 6a  Colorado : Boulder Canyon : ... : The Bihedral (Upper Tier)
    This route is one of two routes up the striking headwall that caps the Bihedral.This climb can be seen easily from the road on the top 1/4 of the Bihedral. It starts in a overhanging handcrack for a few meters, gains a small square pod/cave, then exits the feature on the right hand side in sustained tight finger-locks and sidepulls, going up to a tree at the summit.P1: Approach via the climb Rhodian Shores, Crack Variation, or Bihedral Arete. After the belay common to all of those, continue, te...[more]   Browse More Classics in Colorado

    Photos of The Bihedral Area Slideshow Add Photo
    Rock Climbing Photo: Bihedral Rock Area.
    Bihedral Rock Area.

    Comments on The Bihedral Area Add Comment
    Show which comments
    By E Johnson
    From: Boulder, CO
    Apr 3, 2007
    Ticks have arrived. Despite a tick check of clothing and ankles, a baby tick made it home with me and was discovered inside my shirt (4 layers deep). Be thorough in your tick checks!
    By Dane Casterson
    From: Boulder
    Feb 22, 2011
    Does anyone know what a Bihedral is?
    By Ken Duncan
    From: Ft Collins, CO
    Dec 15, 2012
    I assume two dihedrals.
    By Adam Kroz
    From: Boulder, CO
    Apr 1, 2013
    I left a navy blue Icebreaker thermal up here yesterday, in case anyone picked it up. Thanks!
    By Stephen Trent
    May 22, 2013
    Any good camping nearby? Preferably free?
    By Todd C
    From: San Diego
    Nov 12, 2016
    FOUND. I found a couple of Petzl quickdraws on 11/12 2016. If they are yours, just reply to this post with a description including the tape on them, and I'll figure out a way to get them back to you.
    By JD Tulloch
    Jul 27, 2017
    Left a draw on Hold The Line today. Will be back to get it tomorrow. If you find it, please don't steal it :)

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