At Priest Lake, Black Bear? Or Grizzly?

At Pecky's As The Lake Churns, Bill offers the photo above, from Monday, and asks: "A friend of mine met this bear and her cub Monday on Priest Lake trail. Luckily my friend was close to her car and was able to get back inside to take this photo. Do you know someone who can tell us if it’s a grizzly or just a black bear?"
Question: Black bear? Or grizzly?