Never been to Lake Tahoe myself, stuck up here in Cumbria, but I've been following reports from that area for a while now and there's something interesting about how many sightings cluster around large bodies of water. Don't know if that's a genuine pattern or just confirmation bias on my end tbh.
What did it actually look like? Was it moving in a straight line or doing the stop-start thing that keeps coming up in a lot of these reports. Also what time roughly, because I've noticed a few other posts from the western US mentioning last Thursday specifically and I'm trying to work out if any of them line up geographically.
Not saying I know what any of this means, I'm pretty new to all this compared to some of the regulars here, but the water connection is something I keep coming back to. There's similar stuff in UK folklore going back centuries, craft or lights associated with lakes and rivers. Could be nothing but it keeps nagging at me.