Anyone else been seeing a huge black cat near the Shasta Lake area or am I losing my mind

Not losing your mind - big cat sightings in California pop up way more often than people realise. Shasta area specifically has had a few reports over the years if I remember right.

My thing is I always wonder whether these are genuine unknown populations or escaped/released exotic pets that have gone feral. Both explanations are pretty wild honestly. A breeding population of black panthers in the US would be massive news but the alternative - that people are just casually dumping big cats - is somehow equally mental.

What did it look like size wise? Like domestic cat on steroids or genuinely mountain lion scale? And was it definitely black, not just a very dark brown in bad light? Not trying to doubt you, just the details matter a lot with these sightings.

Big cats turning up way outside their known range is something that happens more than official wildlife bodies will ever admit. We've had decades of black panther sightings here in Pendle and the surrounding areas, and they get dismissed every single time despite some genuinely credible witnesses.

The Shasta area is interesting because you've got dense forest, decent prey populations and not that many people wandering about in the right spots. Melanistic mountain lions do exist even if they're incredibly rare, and there's always the escaped exotic angle which nobody wants to talk about properly.

@NotAVoid is right that the reports cluster there. What I'd say to the OP is get a trail cam up if you can, same spot you saw it, set at chest height not knee height, that's the mistake most people make and you just end up with footage of a foxs backside.

Not my territory (I'm Cumbria, UK) but we have the exact same pattern here with big cat sightings - authorities dismiss it, locals keep seeing them, evidence quietly accumulates. The Shasta region is remote enough that a large predator could move through without being properly documented for years. What people often dont realise is that melanistic mountain lions do occasionally get reported, so it might not even be an "out of place" species as such, just an unusual colour variant of something that has every right to be there. What did the animal actually look like - size relative to a dog, tail length, how it moved? Those details matter a lot more than people think when trying to work out what you actually saw.