Twin Sisters Rock Climbing
|GPS:||42.053, -113.711 Google Map · Climbing Area Map|
|Page Views:||6,943 total · 83/month|
|Shared By:||Matt Schroer on Mar 19, 2013|
|Admins:||grk10vq, Mike Engle|
The Twin Sisters are two dramatic granite spires that mark the high points of a mile-long rock ridge that is separated from the rest of the reserve by about 2 miles. The north spire (~500 feet tall) is composed of the 28 million year old Almo Pluton granite, while the south spire (~600 feet tall) is comprised of the 2.5 billion year old Green Creek Complex granite and represents some of the oldest exposed rock on the continent.
The cultural history of the Twin Sisters is rich. Between 1843 and 1882, nearly 250,000 immigrants traveled through City of Rocks on the California Trail, using the Twin Sisters as a major landmark on their journey. Prior to receiving their current name in 1848, immigrant journals mentioned the formations under various names, including "Steeple Rocks", "Twin Mounds", "Twin Buttes", "Two Dome Mountain", and others. Inconclusive ethnographic information also hints at the formations being of important spiritual value to the area's Native American groups.
The earliest known climbing ascents on the Twin Sisters were completed in the 1960's by the renowned and visionary Lowe party, which included Greg, Jeff, and George Lowe. The Twin Sisters house some of the longest and highest quality rock in the City of Rocks, ranging from historical, Yosemite-esque crack lines to highly technical face routes. I invite others with more (personal) knowledge of these routes to add them here 1) for future reference, in case the climbing ban is ever lifted and 2) for posterity's sake, as I, for one, enjoy following the early history of North American climbing.
"City of Rocks, Idaho: A Climbers Guide" by David Bingham, 2009
"Administrative History: Twin Sisters" Department of the Interior, National Park Service, Pacific West Region, 2011
"Etched in Stone: The Geology of City of Rocks National Reserve and Castle Rocks State Park, Idaho" by Kevin R. Pogue, 2008
Classic Climbing Routes at Twin Sisters
Days w Precip