Here is a plea from Mono County to visitors:

https://webapps.mono.ca.gov/COVIDDocs//P...%20Visitors.pdf

Highway 203 into Mammoth Lakes is open with chain requirements. There has been a lot of heavy snow.

As we can see from the Mono County press release, it is still possible to enter Mammoth Lakes, but it is not encouraged. However, this situation might change as time goes on.

I'm not posting this in order to score posting points, but to attempt to point out the seriousness of the situation.