These galls are near the tip of a branch on a juniper by the side of the road, in Arches NP. Rangers at the visitor’s center suggested either Juniper Tip Midge or Eriophyd mites, though it doesn’t look like the pictures I’ve found of the galls formed by the midge. I can’t seem to find reference photos of galls caused by mites on juniper at all. Any help would be welcome!