Maybe not in Sacramento, but moose and bear are not uncommon in the Sierras; plus Nevada isn't far, coyotes and rattlesnakes are quite common there.
This is why I take different rifles depending on the habitat I'm visiting. A 5.56mm AR-15 is a great coyote gun for the desert (and there is a bounty on them in my state, a lower jaw will get you $50 - not that I hunt) but won't do much to large predators. For that a .308, 7mm Magnum, .30-30, .30-06, .45-70 gov't, or a .44 Magnum is really more appropriate. Since my .308 is a long-range build and weighs as much as a VW, I don't like hauling it around, so the .44 Mag works for now until I can get that Henry .45-70.
Now, I should say: I'm not a hunter and I certainly don't want to shoot an animal if it can be avoided. Good discipline with food and garbage will do a lot to prevent animals from coming into camp. I'd much rather take photographs of the critters than look at them down the barrel of a gun.
Here's an encounter I had last year while exploring the Uintah Mountains
I stopped and took some photos, but even though he was across a stream and down an embankment, I was never far from the car and ready to run at a moment's notice. Moose can run at over 30 mph through 5' of snow, so crossing a small creek would be nothing for a guy this size.