Garter snake species? [Northern California]

There were so many of these guys sunning themselves I lost count.

I’m stupidly excited about this wetland area and the changing biota, and one of the things I’ve seen in the last three years is the seasonal appearance of these guys when it starts to warm up. The rattlesnakes are always there, occasionally a king snake or gopher snake, but when I see eight or nine garter snakes I just feel like it’s a party.