And thank you for all your BugGuide contributions !!

Would this be a female(?) Epeolus americanus ?

Does seem to be a female

I guess I was playing Devil's advocate in proposing Epeolus americanus.

The following four Epeolus species are expected in this area: E. americanus, E. compactus, E. mesillae, & E. minimum.
E. mesillae can be excluded based on number of submarginal cells, and E. minimum does not resemble well overall.
A fifth potential candidate, with records from distant Lake Tahoe area, is E. scopulus, but its legs are supposed to be almost all black.

This leaves E. americanus and E. compactus.
E. americanus' scutum has mostly dark-coppery pubescence, except for two white lines; which doesn't seem to match very well.
But I didn't find any stonger evidence for excluding it ...

E. compactus matches fairly well, but I can't discern:
- scutum weakly rugose, and with sparse, white or pale coppery pubescence; and
- vertex with sparse, erect, long, off-white hairs around ocelli.
These could be due to the lack of detail in the photos.

I therefore agree that it is most likely E. compactus;
but I would like to make a stronger case for excluding E. americanus.