About a year ago, I got in my head that I wanted to circumnavigate Mount St Helen's in one day using the Loowit Trail. This summer I finally felt that I was conditioned enough to make this journey. I should point out that I did this as a trail run, so packed just the essentials and was moving quickly.
Started in at the June Lake TH around 0700 and quickly gained access to the Loowit trail after about 1.5 miles. It wasn't long after that when I hit the lava fields. Be advised, these are slow going and require a lot of "boulder hopping", take it slow and be careful as the rocks are lighter than they look and will move on you. For a bit I was concerned at my pace navigating these fields, but a couple of miles past the climbers route, you put these behind you.
The biggest obstacle after that was the Toutle River drainage, you really have to drop down to cross this. There are ropes to assist you if you need them at the drainage, and you are going to get wet. Once you cross, you head back up and things even out as you top out of the drainage. Despite the hardships, you are rewarded with a very diverse landscape that will leave you gaping. Unfortunately, I did this on a rainy day and wasn't treated to views of the mountain itself.
Crossing the blast plain is incredible with one major fording spot. From there you can cruise up and over to the Plains of Abraham and more incredible landscapes. As you round about to the south side again, be prepared to drop down in and back up out of some major drainages. After going for about 25 miles, these get to be a challenge. Finally, you drop down and at about 31 miles I hit the June Lake Trail and back to the car.
Total mileage was 32, elevation gain was 7,000 feet. of note, water sources are limited, about five around the entire mountain.
A great adventure!