Elevation: 4,000 ft
GPS: 42.675, -112.998 Google Map · Climbing Area Map
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Shared By: Andy Laakmann on Nov 13, 2006
Admins: Mike Engle


Massacre Rocks is a large natural area of sagebrush, ancient cedar trees, sand dunes, and box canyons sculpted by the Great Bonneville flood some 14,000 years ago. The flood carved numerous natural box canyons and 'alcoves' leaving steep rock walls ranging from 30' to 200' in height. The exposed basalt formations were originally formed from repeated volcanic activity in the Snake River Plain. The rock is high quality black, brown, and tan basalt. It is steep (sometimes overhanging) and heavily featured with edges, pockets, blocks, slopers, bulges, dihedrals, and cracks - perfect for much varied sport climbing.

Massacre Rocks is part of the much larger “American Falls Archaeological District” (AFAD). mountainproject.com/v/11224… There are multiple land jurisdictions in both the AFAD and where climbing takes place (see BLM Map). Extensive and well documented studies of the AFAD near and around the Snake River show many cultural resources and evidence of human habitation for at least the last 13,000 years. This area is considered sacred to the Shoshone peoples. Be respectful and minimize your footprint and impact in the area. Keep your staging area small and contained. Pick up and pack out your trash including tape, orange or banana peels, cigarette butts, etc. Prevent your dog from digging. Don’t start or make any fires, especially near the base of cliffs.

In an effort to respect the cultural resources and tribal concerns, several routes names in this guide were changed to honor a request to eliminate potentially offensive names.

Remember, as on any Federal land, damaging cultural resources is a felony and punishable by fines and imprisonment. Deception Cove is posted closed to climbing. Please respect this and any other closures. While nearly all the established climbing cliffs do not have known petroglyphs or pictographs, should you happen to find one, usually near ground level, cease climbing and notify the Bureau of Land Management at the Burley Field Office, 208 677 6600.

Also, please, only park in one of the designated parking areas and respect all road closures. Sandy soils in the AFAD are prone to wind erosion. Motorized vehicles and even foot traffic can damage the fragile ecology and could destroy rare, irreplaceable evidence of 13,000 years of human habitation. When hiking to the crags use established trails and don’t short cut or braid existing trails. See the graphic from the BLM to understand which areas are closed to motorized travel. mountainproject.com/v/11180…

Massacre rocks sport climbing area is not within the Massacre Rocks State Park boundaries (though there is fine documented bouldering within the state park). The crags reside on a combination of Idaho state land, Bureau of Reclamation (BOR) land, and Bureau of Land Management (BLM) land. In 2012 the BLM sought to limit or close climbing due to possible damage to cultural artifacts in the area. Ultimately, no action was taken and currently there are no restrictions on climbing on any of the Massacre Rocks land jurisdictions (as of April 2016). Many of the popular crags and climbs are on Idaho State Land where access was never threatened.

However, the BLM and BOR are collaborating to rollout a new management plan for the entire American Falls Archeological District by end of 2016 or early 2017. It is likely climbing will be impacted to some level. East Idaho Climber’s Coalition is working with the BLM and BOR to mitigate any issues and work towards a management plan that is most friendly to climbing. Stay tuned for public comment periods. Continuing to have a low impact footprint at Massacre can be a big help in the ongoing process. Be respectful, stay off private land, and be aware of cultural resource issues.

Massacre Rocks was one of the first modern climbing areas in the United States to fully embrace the sport climbing ethic. Most of the routes here were established in the 80's and 90's.

There are over 750 well equipped sport routes at Massacre on more than two dozen different walls ranging from 30' to 200' in height. The average climb is about 60'. The "climb anywhere" nature of the rock has led to a high concentration of routes on most walls. Sometimes routes are as close as 5 or 6 feet apart which can make identifying routes a challenge. A good strategy is to count bolts. Once a route has been identified, it's easy to track routes to the right or left. This guide and the free online guide have accurate bolt counts for most route descriptions.

The sport climbs at Massacre typically have closely spaced bolts for pushing your limits. Climbs range from 5.8 to 5.13 with most being in the middle of that range. If you climb 5.10 to 5.12 and like to clip bolts, you will find a nearly endless supply of high quality sport climbing.

A rack of up to 18 quick draws will suffice on the longer routes, while the majority of climbs take six to eight. There are some natural pro lines but they are seldom climbed. For these a standard rack of cams and nuts should do the trick.

The vast majority of routes have sport anchors which are typically an open cold shut and a steel or aluminum carabiner. This makes finishing and lowering from a route convenient. Please use your own gear if you plan to top rope the route. Occasionally, the routes will have chain anchors at the top of the climb, if in doubt always bring a couple extra draws.

Most climbs at Massacre allow a leader to be lowered using a single 60 meter rope however some longer routes may require two ropes. There have been lowering accidents at Massacre, so if you are not sure, tie a knot in the end of the rope so you don’t drop your partner, or even better, take two ropes. The Owl Cove, Main Wall Area, and Eagle Wall are places to watch out for two rope descents.

The best climbing weather at Massacre is in the late fall and early spring although there are many very climbable days in the winter. Provided the sun is out, the dark rock and wind protected alcoves create micro-climates where it's possible to climb in t-shirts on 30 F winter days. These same features make climbing in the summer unbearably hot, though early morning or late evening outings on shady walls are possible.

There is pleasant but primitive free camping at several locations near the parking on the west rim. Bring your own water, firewood and shovel.

There are rattlesnakes in the area though they are typically not a problem. If you bring dogs or children scope the area before settling down to climb.

It can be extremely hot at Massacre during the summer. The sand can burn bare feet. Dogs in particular can have a very tough time with the hot sand. Due to some long treks across hot sand, it is not advisable to bring dogs during summer, even if you intend to climb in the shade.

Getting There

Massacre Rocks is situated across the Snake River, northwest from Massacre Rocks State Park entrance fee station; the 200 foot Main Wall is visible from Interstate 86. Traditionally climbers accessed Main Wall and Owl Cove by taking a canoe across the Snake River. However the vast majority of the climbing is in box canyons and alcoves situated behind Owl Cove and Main Wall. For easier access to these walls climbers drive across the American Falls Reservoir Dam and follow paved roads to a public access dirt road. Three miles of two-track lead parking areas along the west rims. From the the parking, some crags can be reached in as little as five minutes and the Main Wall is still only a 30 min hike through the back country.

Crag locations and detailed driving directions can be found in the "Beta" pictures.

If you have access to a boat, the quickest and easiest way to reach the Main Wall and Owl Cove is to cross the Snake River at Massacre State Park. Drive about 11.5 miles west of American Falls on I-86. Take the Massacre Rocks exit, exit #28. Park your vehicle near the fee station and portage your boat about 200 yards along a faint trail to the river. If you paddle straight across the river you will be near the entrance to Owl Cove. Alternatively, you can drive to the boat ramp, put in, and navigate a quarter mile upriver.

If you don't have a boat or want to a short hike to most crags, driving in the back way is the best option. The last three miles of this drive is on a two-track dirt road that requires moderate clearance. While trucks and Subaru's have no problem and plenty of sedans (like Camrys and Accords) have made it too, be aware that clearance may be an issue.

From the town of American Falls, take State Highway 39 across the American Falls Reservoir dam. Take the first left turn onto the Lamb-Weston Road and set your trip odometer to zero.

  • 0.0 miles: Left turn onto Lamb-Weston Road
  • 0.2 miles: Turn left onto Borah Road
  • 1.8 miles: Turn left onto the paved Lake Channel Road; it follows the river for awhile before heading across potato fields.
  • 13.7 miles: Turn left onto a dirt two-track road. Follow this road for about 100 yards all the way to the fence line. A very short distance before the fence, you will cross a dirt road. DO NOT TURN RIGHT YET!! Go all the way to the fence and then turn right and follow the fence line until you come to a BLM gate at 14.1 miles.
  • 14.1 miles: Turn left and go through the BLM gate (please close it behind you). Continue along a two-track dirt road. You will pass through a couple more gates and at 16.5 miles veer right at a subtle turn.
  • 17.1 miles: Take the right fork and continue on a well used two-track dirt road.
  • 17.7 miles: Most popular parking spot. "P2" on the access map.

350 Total Climbs

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Classic Climbing Routes at Massacre Rocks

Mountain Project's determination of the classic, most popular, highest rated climbing routes in this area.
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Bill Ballace
Bill Ballace   Pullman,WA
Surprisingly "Rocn'n Road", by Tim Toula, Gives this area four out of five stars, while he gives City of Rocks only three. This makes me want to check Massacre out. Jul 12, 2007
Andy Laakmann
Bend, OR
Andy Laakmann   Bend, OR  
I'd give the City 4/5 stars.. Massacre, maybe 2/5 stars. Massacre's advantage is warmer temps in the cool seasons, but the climbing can't touch what the City has to offer. The City is a world class destination... Massacre, while fun, is most certainly not. Aug 3, 2007
Missoula, MT
ktmt   Missoula, MT
Agree completely with Massacre 2/5 stars, City 4/5. Massacre is good early spring destination when City is snowed in. It's a fun place, great for mileage and clipping bolts. Like a big outdoor climbing gym with hawks. Nov 15, 2008
This was the first place I went to do outdoor sport climbing after starting in the gym. I feel like it was a great place for a beginner for several reasons, one of which was that there was no one else there (though it was a weekday). Thus, it was easy for us to take our time, and I felt comfortable getting used to things. The location was easy to get to, and it was really warm for early March. We camped out under the stars and enjoyed some great beers from The Grapevine in Pocatello. I could not have asked for a better first experience climbing outdoors. So - from a beginner's perspective, I'd have to say I recommend it highly. Since Massacre, I have done a few climbs in Little Cottonwood Canyon in SLC and they were much more nerve-wracking for me. Apr 30, 2009
As a semi-local and City of Rocks guide author, my 2 cents is that Massacre is one of the best pure-sport areas in the U.S! With an ungodly number of featured basalt routes,(upwards of 700)this is one of the best places on earth for cranking mass quantities of sport routes. Nearby City of Rocks is great, but lacks classic "sport" walls where you can open up the rope bag and climb all day.

Two things keep Massacre from being an A-list area. Firstly, access is adventurous, involving complex route finding from the small town of American Falls, finishing with tricky navigation on sandy tracks w several fence crossings. Good directions can be had online at the ISU website. Traditionally, the "Main Wall" was approached by crossing the Snake River via canoe at Massacre Rocks State Park. For several years, locals kept boats stashed for fellow climber use, but that ended after several boats disappeared.

The other negative factor (or positive depending on your preference) is that the bulk of the climbs are solid 5.11, and don't offer much if you don't climb at least 5.10.If you operate in the upper .11 zone, Massacre is onsight paradise, with lots of crazy (challenging)sequences and cool features.

Most of the use these days is in the back alcove areas, a unique landscape of sandy coves sculpted by the ice-age Bonneville Flood. Most of the climbs are 100' or less, but amazingly equipped with ample bolts and quick-lowering anchors.

There is sweet (free) camping in the sandy juniper on the rim, with many crags within a few minutes of camp.

Apr 7, 2010
Spot on Dave. Spot on. Your 2 cents is worth a dollar. Thanks for the guide books for the City by the way. My favorite place since My dad started taking me there when I was 2 years old. Apr 20, 2010
Ezra Ellis
Ezra Ellis   Hotlanta
Rattle snake

There is a rattle snake in may of 2011 on the all american wall 50 feet to the climbers left of Rawhide May 29, 2011
Brian Fedigan
Boise, ID
Brian Fedigan   Boise, ID
If you have not heard the BLM is proposing closing this crag to climbing due to protection of cultural resources. If you want to help please contact your concerns to Mike Courtney of the BLM: mcourtney@blm.gov. You can also be added to a master email list by contacting Troy Neu at tneu@oldtownembroidery.com. This is AN AWESOME CRAG; please help keep it open. July 2011 Jul 15, 2011
Brian Fedigan
Boise, ID
Brian Fedigan   Boise, ID
The Massacre Rocks closure has been listed on the Federal Register. That means you have thirty days to comment on the closure. BE HEARD, WRITE A LETTER. Send your letter and/or comments to the BLM by going to their website blm.gov/id/st/en/info/nepa.…, emailing them id_burley_fo_@blm.gov, mailing them 15 East 200 South Burley, ID 83318 or faxing them at 208-677-6699 PLEASE ACT NOW! Aug 25, 2011
Fillmore, UT
nelsras   Fillmore, UT
Online guidebook maintained by Bruce A. Black has moved to


Check it out. Aug 11, 2012
Ken Aho  
I agree with D. Bingham. Based on my experience, climbing all over Western US for 20+ years, I find that Massacre ranks among the best sport climbing destinations.

The routes are generally difficult for beginners (>10d) and the access is a bit complex (see www.seiclimbing.com). Upon arrival, however, you will generally find that you have over 600 mostly-high-quality routes to yourself.

Climbing is also possible year round. In the summer months go in the morning to West-Facing walls (e.g., La Petite Covette, Hobbit Wall, Eagle Wall), and in the evening go to East-facing walls (e.g., Love Connection, Red Light District).
Jul 9, 2014
Matt Enlow
Matt Enlow   Wyoming
Spent a day here, had a great time. No photos of anyone climbing as there were just the two of us though... added a few beta photos here on MP to help folks get around, and I have a teency blog post on it as well: blog.novaugust.net/massacre… Apr 14, 2015
Mike Engle
Pocatello, Idaho
Mike Engle   Pocatello, Idaho  
There is a new version of the free online Massacre Guidebook, highlights include:

  • Reformatted to be more compact and easily printed, cut and bound into a handy 5"x8" field guide.
  • Smart phone version available too. Formatted for small screens and in the field use.
  • New graphics for the public access driving directions.
  • New graphics for the cliff/crag locations at Massacre.
  • New table of contents to find areas and crags more quickly.
  • Downloadable .pdf file format for easier printing.

Massacre Rocks Climbing Guide Dec 13, 2015
We went there this August and I have to say IT IS AMAZING! One of the best sport climbing areas I have ever been to. Great Rock quality, short approaches (if you are camping there), no trad gead needed and the surrounding landscape is just nice. The Access with a car is not a Problem if you have a Jeep. Nevertheless, we got almost stuck in the Sandy Road one time... I would still give the area 5 Stars, thank to the developers for the effort! Aug 16, 2016
Just want to say this place kicks ass. Mar 29, 2017
Hi all, I am planning a trip here with a few friends for spring break. I am trying to get a feel of where to park and camp as well as where everything is. This is a good start but if anybody has a copy of the climbing guide that they could send us, it would be very helpful as it has seemed to disappear from the internet. Also, any maps of parking and camping would be very appreciated. Cheers Mar 4, 2018
Mike Engle
Pocatello, Idaho
Mike Engle   Pocatello, Idaho  
Hello Isaac, the free online guide is off line and will be for awhile due to pending actions by the BLM that threaten access to some of the crags in the area. Any potential closures likely won't happen until late in the year 2018 or early 2019. You're best option for a comprehensive guide is the Eastern Idaho Sweet Spots by Matt TeNgaio. If you can't get a copy, there is quite a bit of information here on MP. This area overview graphic map mountainproject.com/photo/1… shows the major crags and the best places to park. The best camping is on the west rim between parking P2 to P4. The main page also has a graphic for driving instructions. Most of the best crags are posted here as well. If you scroll through these pages you will find that most of crags have 'beta' photos of the cliffs with routes drawn in. You should be able to find what your looking for. Spring is a great time to climb here but you can lose a day or two to rain. Good luck. Mar 6, 2018