H.J. Andrews Experimental Forest

The H.J. Andrews Experimental Forest is located in Oregon, in the Cascade Mountains. The entire 15,800-acre (6400-ha) site is the watershed, or drainage basin, of Lookout Creek. The landscape is steep, with hills and deep valleys. Elevation ranges from 1,350 to 5,340 feet (410 to 1,630 meters). Cold and fast running streams flow through the many valleys of the forest. Most of the landscape is covered in dense forest. Huge, iconic Pacific Northwest old-growth conifer forests grow here with cedar, hemlock, and moss-draped ancient Douglas fir trees. Some of these trees grow as high as 250 feet (75 meters), and many of them are 300, 500, a few even 700 years old.

We are ecosystem scientists, educators, natural resource managers, writers, artists, musicians, and photographers. The Andrews Forest Program at the H.J. Andrews Experimental Forest is administered cooperatively by the USDA Forest Service’s Pacific Northwest Research Station (USFS Research), Oregon State University (OSU), and the Willamette National Forest. Funding and support come from the National Science Foundation (NSF), Pacific Northwest Research Station, Oregon State University and the College of Forestry, charitable support, and other sources. The Andrews Forest LTER program is one of 25 major ecosystem research sites funded through NSF’s Long-Term Ecological Research (LTER) Program and the H.J. Andrews Experimental Forest is one of 81 USDA Experimental Forests.

The Andrews Forest Program is a center for forest and stream ecosystem research in the Pacific Northwest. We collaborate with dozens of university and federal scientists, students, and managers to support ecosystem science, education, natural resource management, and the arts and humanities. The program has its roots in the establishment of the H.J. Andrews Experimental Forest in 1948 by the US Forest Service. At that time, the forest was a mix of old-growth and mature forest. Beginning in the 1950s, several small watersheds were manipulated (for example, logged or not logged) to lay a foundation for research on how the ecosystem works, how plants regrow in the forest, how nutrients move through the system, and how the forest and streams interact.  The Andrews Forest Program became a charter member of the National Science Foundation’s Long Term Ecological Research (LTER) program in 1980, and long-term measurement programs continued on experimental sites and watersheds with a focus on questions about climate, streamflow, water quality, vegetation succession, biogeochemical cycling, and effects of forest management.