Three students, UW’s Dr. Tim Billo, forest steward Paul Shannon, 500 hours of field work, 724 trees. We determined that hemlock mortality is concentrated in one six-acre site, with thriving hemlocks elsewhere, of all ages. This establishes that neither climate nor old-age is the cause. And it presents an opportunity for further study. Something is killing hemlocks, but it is not weather patterns, soil, geology or old age. The final report, with interactive map, data table, and statistics is here. DNA sequencing of failing hemlocks and sword ferns scheduled for this summer.