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To reach Mossyrock, take I-5 to the hwy 12 exit just south of Chehalis. Take hiway 12 East towards Yakima for21 miles. There is a blinking light at the Mossyrock exit. Turn right at the blinking light, which is Williams Street. If you are coming from East of Mossyrock, take hwy 12 west about 12 miles from Morton. Turn left at the blinking light on Williams St. Along the way, enjoy the breathtaking scenery with views of both Mt. St. Hellens and Mt. Rainier.