Not from Utah, but I have been looking into native terrestrial mosses for keeping in aquatic conditions. Essentially what I have discovered so far is that:
1) mosses are generally not well documented unless you live near a Bryologists (someone who studies moss).
2) most mosses require a hand glass and the plant to be flowering before it can be properly identified.
3) A large range of mosses will keep just fine in an aquarium but their submersed state frequently looks... messy.
4) Your best bet in actually keeping moss in an aquatic condition is to literally go get some, wash it real well, then stick it in a bucket for a few weeks and wait and see if it falls apart. If it does then don't use that one. Keep looking and you should find ones that do keep underwater.
5) I have seen others do this a bunch online but I have only tried this only a handful of times but the one I found I liked the most (so far) was found in a stream growing on a rock that was currently dry but obviously had been flooded in the past. This makes sense but /shrug I otherwise didn't think about it prior to discovering it.
6) I have heard elsewhere that liverworts do very well in aquatic conditions but I haven't found and tried any myself.
If you are looking at mosses already growing full submerged and not terrestrial mosses then sorry but I got nothing. I have never seen one in the wild.