I'm certain more people can chime in on this, but I know Diamond Valley Lake, and the Colorado river i.e. Lake Havasu are hot spots for nice size stripers. I can't think of any other lakes that are really in So Cal that hold stripers... Casitas maybe? Zara Spooks, Hedon topwater lures, rattle traps, and swimbaits are usually a good bet if you're fishing artificials. Otherwise cut sardines/ anchovies are a good bait to soak.
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