2014 Update: The U.S. Forest Service has reopened Eagle Rock and Security Risk climbing areas in Boulder Canyon which have been closed since Feb. 1 to protect golden eagles during their nesting season. Blob Rock and Bitty Buttress areas remain CLOSED.
Each year, Boulder Canyon raptor nesting area closures are in effect starting February 1st through July 31st at Eagle Rock, Security Risk, Blob Rock, and Bitty Buttress. However, the area is monitored and closures are periodically lifted early (due to no active nest, nest site failure, or early fledging). This monitoring program is a partnership with the Forest Service Boulder Ranger District, Boulder Climbing Community, and Audubon Society. Check back periodically during times of closure for updates. More info at www.fs.usda.gov/recmain/arp/recreation.
This information is a public crowdsourcing effort between the Access Fund,
and Mountain Project. You should confirm closures, restrictions, and/or related dates.
Dihedral Variation is a great alternate start to Bihedral Arete. Try it the next time you go up to do Bihedral Arete -- you won't be disappointed.
EDIT: The following text was added by someone other than me, and is not my opinon: ("The protection is good -- two bolts were added with permission from the FA Jim Erickson in February 2009. The dead bush at the crux was removed, dirt cleaned from the crack, and lichen brushed off the walls of the dihedral. It's a fun, physical climb that deserves to see more traffic on lead.")
This is the shallow dihedral between Bihedral Route and Bihedral Arete. Climb up the right face using holds on the arete, then work back left to the corner.
EDIT: The following text was added by someone other than me, and is not my opinon: ("Two bolts protect the crux, with good gear placements before and after. Exit right at the top of the dihedral, and continue up p1 of Bihedral Arete.")
You can rap 100' from a 2-bolt anchor at the top of p1 of Bihedral Arete with a 60m rope, or continue up p2 of Bihedral Arete (10a), or up the last pitch of Flags of Our Fathers (9), and descend via two rappels.
2 bolts and gear from small wires to a 0.75" cam (green Camalot) for the initial dihedral, then QDs and gear to 2" for the rest of p1 of Bihedral Arete. 2-bolt anchor at the top of p1 of Bihedral Arete.