Stay away from my lake, Californians. It’s too important, for the likes of you. Yes, as a legal matter, I don’t own Lake Mathews. But I’ve always felt a kinship with a Riverside County reservoir that spells our mutual name the correct way, with just one “t.” What’s more, Lake Mathews serves as the beating heart of the system that supplies water for me and millions of Southern Californians. Lake Mathews represents an end and a beginning.