We were there in 2000 and some of the ranger talks were about how the ground is rising, building up pressure again. At one end of Yellowstone lake, the water is receding. At the other end it's rising. It would affect a lot more than 1,000 miles around if it goes off again.
But what a place! Never saw so much wildlife and the scenery is spectacular. Saw grizzly bears twice, more bison and elk than we could count, moose, mule deer, bald eagles, coyotes, you name it. Thank you, Teddy Roosevelt.
And who knew you could fish in a national park??? I didn't find that out before we went and my husband was extremely ticked off because we hadn't brought any gear and he could have fished. Oops!