The emergence of aquatic insects influences the diversity and ecology of aquatic and terrestrial systems. With an increasingly variable climate worldwide, streams may be shifting between perennial and intermittent states. How the community composition will respond to or be impacted by these shifts is uncertain. In this study, we studied the environmental variables influencing the composition and structure of adult aquatic insect communities among adjacent streams with different flow conditions. For this purpose, during the summer of 2022 at the HJ Andrews Experimental Forest, we collected aquatic insects using emergence traps each three days two months, then identified them in the laboratory to the lowest taxonomic level and analyzed the structure and composition of these groups. At the time of collection, we also measured environmental variables, including water temperature, channel width and depth, canopy cover, and substrate. Across 9 intermittent and eight perennial streams, Ephemeroptera and Plecoptera showed higher abundances in intermittent sites, while Trichoptera maintained consistent abundances under differing conditions of water flow effect. Our preliminary results showed that the wetted width, temperature, and altitudinal range are good predictors of insect community composition for these intermittent and perennial tributaries of Lookout Creek (OR). Also, some genera, such as Yoraperla and Wormaldia, may respond to desiccation. Regarding the flow of aquatic-derived biomass into adjacent terrestrial ecosystems, peaks in emergence during the first sampling dates (late June- late July) correspond to periods of elevated cross-ecosystem energy transfer, providing key subsidies that support riparian predators such as spiders, beetles, and birds, as well as other terrestrial consumers.