Actually 2 in Chico, they opened another on the north side of town on Cohasset. Never been there but saw it driving by to a job site last year.
Seriously, if you've never been, go to Red Robin - there is one just east of Hwy 99 on the south side of Hwy 20. Good shakes, good all you can eat steak fries, and great burgers.
And I'm not hungry right now - diving into some teriyaki chicken and spicy chicken with rice. MMMMMM.
I still need to hit Squeeze Inn over in South Sacramento area (I think) - supposed to be some darn good burgers there, too.