(Castle Rock, WA) -- The Mt. St. Helens Visitor Center in Castle Rock will temporarily close September 30th. The facility will get an upgrade. Many of the center's exhibits were constructed in 1986, making them almost 40 years old. Since then, the area affected by Mount St. Helens' 1980 eruption has changed dramatically. In addition to showcasing the geological and biological history of the region, the new exhibits will document the regrowth and transformation of the area in the last 44 years. The Visitor Center will reopen May of next year.