Visiting our sites while the Arctic still clings to winter provides important insights for our research, particularly factors that might impart resilience to tundra stream communities as Arctic conditions become more variable with climate change. Last summer, two of our streams showed extensive river drying due to severe summer drought, but miraculously the I-Minus outlet stream continued to flow. As we traveled the I-Minus today by snow machine, possible reasons for the streams resilience to drying revealed themselves in the form of overflow ice, aufeis, and a fish-supporting spring. Overflow ice and aufeis both result from water flowing during winter and freezing when it hits the -40 degree air temperature. If spring water is warm enough, just above freezing, small stretches of unfrozen river might persist throughout the winter and provide overwintering refuge in an otherwise uninhabitable stream. Today, impressive amounts of overflow ice filled stream channels to the brim, and in some cases over the brim and onto our antenna stations! Most excitingly, the expansive I-Minus lower aufeis appeared largely to be sourced from a single spring located in the main stem of our study river and our guest, Dana Truffer-Moudra, found a young Arctic grayling alive and well after a long cold winter. Best of all, where there’s one Arctic grayling overwintering, there’re probably many more.