I was just down there this weekend. The "close" volcano overlook at Johnson Ridge was closed, the "faraway" visitors' center (five miles east of I-5) was open but charges an admission fee, the sky was overcast with light rain and we couldn't see a thing. So we said the heck with it. As it's a two-hour drive from Seattle I wouldn't give Mt. St. Helens a whole vacation day (and tank of gas at $2.70/gal) unless the weather is absolutely crystal clear.