Matt, I think we have to take into account the shear number of fishermen out there when the lake are open. Yes some of the SD lake are only open certain days, but when they are,look out, the big bass boats are Flyin to get to their fave spots.
As for most LA county lakes, i.e. Castaic, Piru ect..open 7 days, and yup you can fish em at night. It would be really nice if we (my Son and I) could go to a lake, and not have 30 other people around at the same time.
BTW, there are lakes in Texas I'd love to fish..I'm no expert, nor am I a trohpy hunter.