The Mountain Pine Beetle is at epidemic levels throughout the western United States, including here in the Rocky Mountain Region (Read the Forest Service's Western Bark Beetle Strategy). Forests affected here include several in Colorado, Wyoming, South Dakota and Nebraska. In northern Colorado and southeastern Wyoming, Mountain Pine Beetles have impacted more than 4 million acres since the first signs of outbreak in 1996. The majority of outbreaks have occurred in three forests: Arapaho-Roosevelt, White River and Medicine Bow/Routt.
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http://www.fs.usda.gov/Internet/FSE_DOCUMENTS/stelprdb5338089.pdf