I almost had the place to myself. There were three other people there, the forest service ranger and a father/son team that had a contract to do maintenance on the strip. They had just finished maintenance on the main E/W strip, and were starting to work on the N/S X-wind strip.
Since the Chamberlain airstrip is in the Frank Church wilderness, they can't use motorized or wheeled equipment to work the strip. So, they're using mules! Here's a box plow called a fresno that they use to take down the high spots and fill in the low spots:

Here are Frank and Matt Loomis driving the mule team with a grader on the N/S strip.

This is a shot looking north up the strip

And, the obligatory aerial view.

I spoke with the forest ranger (Brandon), and he was quite welcoming and pleasant. He'll be closing up the ranger station for the winter very soon.
Frank and Matt Loomis were doing a fantastic job, and had a wealth of stories. They packed in with several mules from the end of the road at Big Creek. It took them 9 hours to make the trip, compared to 15 minutes in my 172. One year they had a contract to take apart a 38,000 lb Cat D6 and haul it out. They thought they could use a wagon for part of the trip, but no wheeled vehicles allowed, so it got packed out on mules!
At any rate, the main strip is in great shape. All that remains is for them to plant grass in the areas that they graded. The X-wind strip is currently closed while they work on it.