The H. J. Andrews Experimental Forest (HJA) is a 16,000-acre ecological research site that was established in 1948 as a U. S. Forest Service experimental forest. Since 1980, the HJA has been a National Science Foundation Long Term Ecological Research (LTER) site. Located on the western slope of Oregon's Cascade Mountains, the HJA is broadly representative of the rugged mountainous landscape of the Pacific Northwest Forest. The HJA is supported by Oregon State University and the U. S. Forest Service and is funded by the National Science Foundation.

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This site is unique because when it was first established, the majority of the HJA was covered in old-growth forests, consisting of trees more than 500 years old. Today, much of the HJA still consists of impressive old-growth forest stands. In lower elevations, forests consist of Douglas fir, western hemlock, and western red cedar. In upper elevations, forests consist of noble fir, Pacific silver fir, Douglas fir, and western hemlock.

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To learn more about the HJA, visit their website: 

https://andrewsforest.oregonstate.edu/

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To learn more about the LTER program, visit their website: 

https://lternet.edu/