Login with Facebook
The Bihedral Area

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

The Bihedral Area  

Photos:  Recent | Best | Popular
Elevation: 6,850'
Location: 40.0034, -105.3969 View Map  Incorrect?
Page Views: 250,451
Administrators: Ben Mottinger, Leo Paik, John McNamee, Frances Fierst, Monomaniac, Kristine Hoffman (sitewide)
Submitted By: Kreighton Bieger on Sep 13, 2006
Mon Tue Wed Thu Fri
62° | 40°
53° | 36°
Partly Cloudy
41° | 30°
Mostly Cloudy
36° | 28°
Snow Showers
37° | 26°
You & This Area
Best routes for YOU in this area
Your opinion of this PAGE:    [0 people like this page.]

Seasonal Raptor Closure MORE INFO >>>


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

81 Total Routes

['4 Stars',0],['3 Stars',7],['2 Stars',49],['1 Star',23],['Bomb',1]

The Classics

Mountain Project's determination of some of the classic, most popular, highest rated 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)
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)
Flags of Our Fathers   5.9+ 5c 17 VI 17 E1 5a     Trad, Sport, 3 pitches, 200'   The Bihedral (Upper Tier)
Devin's Dihedral   5.9+ 5c 17 VI 17 E1 5a R     Trad, Sport, TR, 1 pitch, 60'   The Riviera
Dihedral Variation   5.9+ 5c 17 VI 17 E1 5a     Trad, Sport, 1 pitch, 100'   The Bihedral (Upper Tier)
Bihedral Arete   5.10a 6a 18 VI+ 18 E1 5a     Trad, Sport, 2 pitches, 180'   The Bihedral (Upper Tier)
Puff Daddy   5.10a 6a 18 VI+ 18 E1 5a     Sport, 1 pitch, 65'   The Bihedral (Upper Tier)
Rhodian Shores   5.10b 6a+ 19 VII- 19 E2 5b     Sport, 1 pitch, 100'   The Bihedral (Upper Tier)
Hound's Tooth   5.10b 6a+ 19 VII- 19 E2 5b     Sport, 1 pitch, 80'   The Lower Tier
Le Nouveau Riche   5.10b 6a+ 19 VII- 19 E2 5b PG13     Trad, Sport, TR, 1 pitch, 85'   The Riviera
Daydreaming   5.10c 6b 20 VII 20 E2 5b     Trad, 1 pitch, 40'   The Bihedral (Upper Tier)
Oh Boy   5.10c/d 6b+ 21 VII+ 21 E3 5b     Trad, Sport, 1 pitch, 80'   The Bihedral (Upper Tier)
Sea Breeze   5.11 6c+ 23 VIII- 23 E4 5c     Sport, 1 pitch, 60'   The Riviera
AHR   5.11c/d 7a 24 VIII 25 E4 6a     Sport, 1 pitch, 70'   The Bihedral (Upper Tier)
Sands of Iwo Jima   5.11c/d 7a 24 VIII 25 E4 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 Classics in The Bihedral Area

Featured Route For The Bihedral Area
Great tip laybacks lead to the third bolt. Photo b...

Sands of Iwo Jima 5.11c/d 7a 24 VIII 25 E4 6a  CO : Boulder Canyon : ... : The Bihedral (Upper Tier)
Exquisite position and movement. You will encounter laybacks, smears, crimps, palming, dynos, backsteps, flags, and an overhang. Quite a few moves packed into a short pitch 200 feet above the ground. Clip the first bolt by climbing near the anchors and reaching right. Then start climbing below the first bolt. This is so you do not fall directly onto the belay. There is one rest below the overhang....[more]   Browse More Classics in CO

Local Information for The Bihedral 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?