What type of snake is this?

I went for a distance run yesterday and I encountered a snake.I stared at it and it stared at me but by the time i gave it a second look it was gone. I live in northern California and want to know what kind of snake is this. Description is it was a creamy white colored with black spots on it. It didn't have a rattle (doubt it's a rattlesnake) and it had dark eyes.