This ID looks right. It had knob less antennae--eg a moth--evidently a diurnal one. There were maybe 6 nectaring on willow catkins.
Same bird as this observation (https://www.inaturalist.org/observations/209396820 ).
It shows a yellow wash underneath which, I believe indicates that it's a female.
Awful screenshot from the Farallones webcam of this continuing rarity
Video on iNat: https://youtu.be/3pP0IDCoSk4
Pin is where the bird was hanging out in a willow. We were standing at a distance watching it, on the trail at the overlook of the "lagoon area" halfway down to the lake from the trailhead
Not in Nevada Co according to Calflora.org but here it is.
2024.04.17 - Cave Rock, Lake Tahoe, NV
2024.04.17 - Cave Rock, Lake Tahoe, NV