if you think it is deserving. I have done both forks of Mill Creek, but not this one - i will look on the map you posted and check it out soon. :~)
It might make a good page. I kno some don't like canyon pags though, so I've been mostly focusing on the ones that require rock climbing to get through.
Maybe I'll create one on this sometime, as I think it is acceptable on SPv2. I was also thinking of a Goblin Valley Page.