Belmont Hot Springs as you may or may not know has been closed due to a bankruptcy of the resort.
A few offers have been given to Camperworld and all have fell through. Early 2015 they were still allowing divers on an appointment cash only basis.
i have recently learned that the resort is closed to all diving until a new owner if found, then it will be a decision of the owner if diving continues.
Looks like for the time being warm water diving in Utah is limited to the Crater, Seabase and Blue Lake.