It depends on the operator's "opspecs" which are negotiated between them and the FAA. Generally in the US the vast majority of part 121 scheduled airline operations are required to be IFR, but plenty of part 135 charters are permitted to fly VFR. They may be subject to weather minimums higher than the general VFR limits.
I had a similar situation flying over the Class C at Albuquerque New Mexico. Albuquerque's Class C goes up to 9,400 and I was flying VFR at 9,500. In this case I was using flight following going from Las Cruces NM to Santa Fe NM and was handed off to Albuquerque Approach. Albuquerque Approach simply told me to notify them if I needed to make any altitude ...
If you don't already have one, get a SLC Terminal Area Chart. Sometimes they will depict VFR reporting points that the Sectionals will not.
Also, airports themselves will publish local area course rules that contain points like this. Check with an FBO, flight school, or tower. And if not published anywhere, just ask as Abelenky suggested.
Wait until the frequency isn't terribly busy on one of your flights, then just:
"Unfamiliar with Creek waypoint, Request clarification"
You can reasonably expect them to either explain the waypoint, or if they're busy, potentially give you a phone number or other contact info to try from the ground.
You can also call an Airport Manager (801-852-6715) for ...