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Three Dihedrals
Routes Sorted
L to R R to L Alpha
Common Denominator T 
Curvilinear T 
Dihedral One T 
Dihedral Two T 
Dom Perignon T,S 
Dominator S 
Dominatrix T 
Pillar T,S 
Unnamed T,S 

Common Denominator 

YDS: 5.9+ French: 5c Ewbanks: 17 UIAA: VI ZA: 17 British: E1 5a

Type:  Trad, 1 pitch, 100'
Original:  YDS: 5.9+ French: 5c Ewbanks: 17 UIAA: VI ZA: 17 British: E1 5a [details]
FA: Richard Rossiter and Joan Johns, 2005
New Route: Yes
Page Views: 52
Submitted By: Richard Rossiter on Jan 15, 2006

You & This Route  |  Other Opinions (15)
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BETA PHOTO: Loose block that used to be above and right of the...

2016 Seasonal Raptor Closures - Eagle Rock remains closed MORE INFO >>>


Approach: Take the left branch in the approach as though going to The Horse, The Tower, et cetera. After about 20 feet, go right on an obvious trail as though going up to The Clipboard. After 50 feet or so, go left around the corner on a ledge and arrive at a pleasant platform beneath the Three Dihedrals, maybe 50 feet short of Curvilinear.

Belay on a great ledge and climb a low-angle slab to a small ledge about 40 feet up (could belay here). Climb a 2-inch crack that angles up to the right and gain a stance at the base of a nice arete. Follow bolts up the arete and face just left of the arete to a 2-bolt anchor with rings at 100 feet. 5 bolts plus gear. Lower off.


This route has 5 bolts, but requires gear from 1 inch to 3 inches in two or three places. Hint: don't bring a big rack; this isn't El Cap. It is also possible to belay on a good ledge about 40 feet up, which will require a few more pieces in the 1 to 3 inch range.

Photos of Common Denominator Slideshow Add Photo
Rock Climbing Photo: At about the crux.
At about the crux.
Rock Climbing Photo: Three Dihedrals.  All climbs start at the base of ...
BETA PHOTO: Three Dihedrals. All climbs start at the base of ...

Comments on Common Denominator Add Comment
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By Ron Olsen
From: Boulder, CO
Apr 16, 2006
rating: 5.9+ 5c 17 VI 17 E1 5a

Some nice moves up the arete and the face. Hardest moves are at the second and third bolts. I used a #2 and #3 Camalot in the crack below the first bolt, and a #.75 Camalot between the third and fourth bolts.

Warning: there is a big loose block above and right of the third bolt. It's ready to go, but there were too many people at Avalon today to trundle it. I will go back there on a weekday and launch it.
By Ron Olsen
From: Boulder, CO
May 19, 2006
rating: 5.9+ 5c 17 VI 17 E1 5a

I trundled the big loose block above and right of the third bolt today (Friday 5/19/06) while no one was around. Other loose rock on ledges was also cleaned up.
By Randy Carmichael
From: Boulder, CO
Sep 19, 2010

I stayed left of the bolts on the face. A good variation and a slight increase in difficulty.
By Clint Locks
From: Boulder
Jun 2, 2013

Could be a great first trad lead. Super fun!

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