Classes start next week so I sneaked out for a quick hike on Tuesday, climbing a minor local peak that is informally called The Obelisk. This one had eluded me for years so it felt nice to finally stand on top. Summitpost says “Obelisk is rarely climbed during the summer and provides ample solitude,” and I found out why: the ascent involves a long, steep boulder field, with many of the rocks just barely balanced. Ugh — the next time I climb this peak it’ll be when the boulders are covered by snow.

Looking out over Cottonwood Ridge.

A couple of friends.

Wild and wonderful Hogum Fork, it sits just a few miles from a half-million people and is hardly visited.

The Obelisk at the top of Obelisk Peak. I could hear the music from 2001.

You can see my summit beer in the background.

Maybird Gulch with the Pfeifferhorn looming beyond.


Matthew Flatt, my 9 year old son, and I stayed out last night watching the Perseid meteor shower. To find some dark skies we drove out to the Utah-Nevada border, along the way passing a sign that said “NEXT GAS 130 MILES” — always a good sign on a road trip. We arrived around 12:30 and the show started right away, we saw several meteors before even getting out of the vehicle. Here’s Matthew in the moonlight along with a very faint meteor:

After the moon set things got better although the sky never got as truly dark as it should have in that location — I don’t think the air was very clear. Even so, the milky way was pretty jaw-dropping and we saw hundreds of meteors. I know nothing about astrophotography and don’t really have the right gear but I did manage to capture a few meteors.

After a while Isaac timed out and went to sleep in the truck and Matthew and I started to get really cold so we left, getting home before dawn. Definitely worth losing a little sleep to see this.

Happy Canyon

I’ve been doing a poor job of taking pictures in Europe. On the other hand, I’ve had a trip report on the back burner since last spring, so let’s look at a few pictures from that.

Happy Canyon, in a remote part of southeast Utah, has a scenic and non-technical narrow section that would be famous if it were easier to get to. There are about five ways to get there, but each has a catch: a very long hike including a rappel, a multi-day hike with poor access to water, a backcountry airplane landing, a float trip on an intermittent river, or a difficult drive. The last option was the only one that made sense for us.

We left Hanksville UT before sunrise and had about a 20-minute drive on pavement before turning off at Poison Spring Canyon where the track follows the bottom of the canyon in and out of the waterway, through mud and sand and pools of water. This canyon is frequently impassable, but it had been bladed since the last flash flood and was mostly lots of fun, with only a few sections of real 4WD. It took us about 40 minutes to drive 11 miles to where the Black Jump road turns off (#1 on the map below). This next road follows a bench between cliffs; it was put in during the 1950s for uranium exploration and, as far as I know, hasn’t been maintained since then. This track had caused me a lot of stress during trip planning and indeed it was a bit exciting: it is partially blocked by rocks, goes right next to cliff edges, has sinkholes in the clay that could eat a wheel, and has some sections of real high-clearance 4WD. It took us about an hour to drive five miles to where the track is finally blocked for good by a bus-sized rock that fell from the cliffs above (#3).

happymap (Map credit: USGS with annotations by rockgremlin.)

So there we are — an 8 year old, a ten year old, and me — parked on a ledge halfway down the 1400-foot deep Dirty Devil River gorge, probably 10 miles from the nearest human being. We continued along the deteriorating mining road on foot; there’s a lot of petrified wood including some entire logs, which are really fun to see. After a while (well past #4 — the folks who made that map dropped down to the river too early) there’s a nice break in the cliffs and we picked our way down to the river, which was flowing in the 80-90 cfs range. We all took off our shoes; the younger boy crossed holding my hand and the older one crossed on his own. The mud was nasty and there was a bit of quicksand, but nothing too hard to avoid. At this point we were at the mouth of Happy Canyon (#5) and we had lunch on the river bank.



Happy Canyon rapidly narrows down and remains narrow for most of a mile, and while it isn’t actually a slot canyon (where you can consistently touch both walls) it is deep and convoluted.







We could have stayed in the narrows for hours, but we had a long (and warm, even in March) hike out and I didn’t want to drive the Black Jump road in the dark. We cooked dinner at the junction with the main Poison Spring road, and then we made it back to Hanksville by dusk.




The next day was less eventful: we visited a little-visited mesa top and found a place where wind or floods had created a perfect little beach along the Fremont River.




On the final day of this quick trip I wanted to visit yet another out-of-the way spot. The boys endured a breakfast of beef jerky and gatorade, a routefinding debacle, an extremely muddy river crossing, and a longish and not-inspiring hike. As a reward, we got to spend an hour or two on the moon before heading home.




Overall this was a successful trip, though we did run into one person while hiking.

Booster Test

Ever since learning that the space shuttle booster motors were manufactured and tested at ATK in Promontory Utah — not too far from where I live — I wanted to see one of the tests. I didn’t manage to do that before the shuttle program was shut down, but today I got to see something better: a test of an SLS booster, which is about 25% more powerful than an STS booster and more than twice as powerful as one of the big F-1 engines from the Saturn V.

Here’s a close-up video. On the other hand, this one shows what the test was like from the viewing area, in particular the 8 seconds it took the noise to reach us. The sound was very impressive, with enough low-frequency power to make my clothing vibrate noticeably, but it was not anywhere close to painfully loud. The flame was, however, painfully bright to look at. The nozzle was being vectored around during the test (I hadn’t realized that the solid rockets participate in guidance) but that wasn’t easy to see from a distance.

NASA socials give some inside access to people like me (and you, if you live in the USA and want to sign up next time) who have no official connection to the space program. Yesterday we got to tour the plant where the boosters are made. It was great to learn about techniques for mixing, casting, and curing huge amounts of propellant without getting air bubbles or other imperfections into the mix and without endangering workers. The buildings in this part of ATK have escape slides from all levels and are surrounded by big earthworks to deflect potential explosions upwards. It was also really cool to see the hardware for hooking boosters to the main rocket, for vectoring nozzles, and things like that. Alas, we weren’t allowed to take pictures on the tour.

ATK’s rocket garden at sunrise:

And the main event:

Adandoned Mineshaft

Due to my 8-year-old’s obsession with Minecraft, the abandoned mineshafts found in the game are an everyday topic of discussion around the house. He is saving up to buy a pickaxe — no joke. Since we needed a day trip for the long weekend, I thought we’d visit some actual mines in the Silver Island Mountains near the Utah-Nevada border. We followed an old road most of the way up a minor mountain and found the remains of either a processing facility or living quarters, and several mine shafts higher up. One of these apparently goes all the way through the mountain but we didn’t do much more than poke our heads in, since it was difficult to gauge how dangerous it was. This area was mined from the 1870s through the 1930s. Since the pathway connecting the mine shafts with the highest vehicle access was too narrow and steep for vehicles, we were forced to assume that ore was transported downhill using some combination of human and animal power — the level of physical effort implied here seemed to be lost on the 8-year-old, who wants a pickaxe more than ever. We saw a pair of pronghorn antelope — but failed to get decent pictures.

Lamus Peak:

Built-up trail used to move ore downhill through rugged country:

Mine shaft:

Another one, with some nice copper ore right at the entrance:

And a lot of nothing in the distance:

Fall in City Creek Canyon

I’ve lived in Utah for a while now, in three different houses, but always a short walk from City Creek Canyon. This drainage starts right at the edge of downtown SLC and goes 14 miles up into the Wasatch Range. A service road provides easy walking access all year, although the upper parts are not plowed in winter. In summer, bikes are permitted on odd days; on even days there is light car traffic. Bikes are allowed and cars forbidden every day in fall, winter, and spring (though sometimes there are vehicles going to and from the water treatment plant a few miles up the canyon). The lower part of the canyon is heavily walked on nice days, for example by worker bees from downtown on their lunch break. The upper canyon receives light usage and there are many miles of trails and off-trail routes in upper City Creek where you are much more likely to see an elk or a moose than a person. Several of my favorite local mountains, Dude Peak, Burro Peak, Grandview Peak, and Little Black Mountain all overlook the upper canyon. Here are a few pictures from a bike ride the other morning.

Broads Fork

After moving to Utah I decided that regularly spending time in the mountains was one of the best ways to stay sane and healthy. Since I usually can’t make time for an all-day hike, I developed a habit getting up around 5, hiking hard for a couple of hours, and then getting into the office by 8:30 or 9. This was nice while it lasted but had to stop once I had kids. However, now that they’re a bit older, I hope to start doing early hikes again, at least occasionally.

One of my favorite trails for a quick hike is Broads Fork, which gains about 2000 feet over 2 miles, ending up at a pretty meadow with a small beaver pond. There never seem to be too many people here; the nearby Lake Blanche trail gets most of the traffic. The Broads Fork trailhead is about a 20 minute drive from the University of Utah or about 25 minutes from downtown SLC.

Cedar Mesa

For years I’d heard people talk about Cedar Mesa, a remote part of southern Utah containing so many Anazazi ruins that it’s basically a huge outdoor museum. Recently my family spent a few days exploring this area. Despite the fact that Cedar Mesa is well-known — it was popularized, in large part, by a book by David Roberts in the 1990s — as far as we could tell nobody was camped within several miles of our campsite off of a high-clearance track near the head of Lime Canyon, seen here in the evening light:

April is a great time to be in the desert but this area is pretty high elevation (6400 feet or almost 2000 m) and it was well below freezing on our first night out. Here the sun is finally starting to warm us up the next morning:

Yep, the kids are wearing their snow pants. Later that morning we visited the Moon House, one of the larger ruins in the area. Although the hike to it is short, the route is circuitous, first dropping over a small pouroff, following a ledge around a corner, and then following a talus slope to the bottom of the canyon, passing between some huge boulders in the bottom of the canyon, climbing most of the way up the other side, and following another ledge behind a big pinnacle. There are good views along the way:

The ruins are impressive:

Life in the desert, though a bit sparse, is often pretty:

The next day we hiked in Natural Bridges National Monument; as you might expect it contains some big natural bridges:

And there were other things to see as well:

Although metates (stone mortars) are a common sight on the Colorado Plateau, something I haven’t seen elsewhere are the manos (grinding stones) since they are so easy to pick up and carry away:

We had great weather in the early part of the trip but got chased home a day early by a rainy night with a forecast for more rain: the roads in this part of the world tend to turn into grease that is impassable even with 4WD when they get wet enough, and we really did not want to get stuck while pulling our tent trailer:

All in all a nice short vacation.

I’m slowly ratcheting down the number of personal blog posts but I will continue to throw in this sort of thing every now and then.

A Few Panoramas

In the early 2000s, decent digital cameras were new and I was obsessed with stitching photos into panoramas. At the time the software sucked and doing a good job was a lot of work. However, I assembled plenty of them and figured out how to get them printed and my house is somewhat littered with panos. In 2013, stitching a good panorama using Photoshop is more or less trivial and paradoxically I’ve largely lost interest. Even so, a recent trip to canyon country resulted in so many good views that I assembled some panoramas for your enjoyment. I’ll just note in passing (now that Utah’s national parks have re-opened, though the government is still shut down) that all of these views are from locations many miles from any kind of park. One of these is from a state highway; the others required more or less serious hikes. If any of my 4400 students are reading this, I hope you will appreciate that I based this trip out of a motel instead of camping so I could respond to your questions at night.

From the top of South Caineville Mesa:

Dirty Devil River from Sam’s Mesa:

Towards the San Rafael Reef from Highway 24:

Looking down on the Mexican Mountain area of the San Rafael Swell:

Partway up a hike to the top of the San Rafael Reef: