Urbanization and impervious surfaces in cities have been shown to negatively impact stream health in predictable ways. Runoff from impervious surfaces changes the physical and chemical makeup of watersheds which negatively impacts in-stream habitats, reducing the ability of the stream to support aquatic insects and other macroinvertebrates communities. However, urban impacts are not necessarily homogenous across cities or even within watersheds. We study the aquatic insect and macroinvertebrate communities across within the highly urbanized Bronx River to identify potential refugia for ecologically sensitive aquatic insects.