Details: The Environmental Conservation Online System (ECOS) is a web-based information portal used by USFWS to communicate, among other things, species information for federally threatened and endangered species. An important component is the current range map depicting expected occurrence and suitable habitat for a species. Ecological Services in Headquarters with partners, is leading the Species Range Project to help improve, standardize, and streamline species range map delineation using advanced and widely accepted ecological methods, data science, and species distribution modeling (SDM) techniques. Occurrence data points, from USFWS and other data sources, are used in conjunction with appropriate biotic and abiotic covariates to build an inductive model to delineate ranges. The Species Range Project has developed a nationwide species distribution modelling platform specific to aquatic species using a variety of stream network, and both catchment- and watershed-level abiotic landscape metrics. Specifically, we used elevation-based catchment areas from NHDPlus Version 2 to obtain stream and stream network associated environmental covariates, such as mean annual precipitation, Strahler stream order, and flow accumulation. Further, we have incorporated the EPA’s StreamCat dataset to include additional abiotic landscape metrics, totaling 89 possible covariates. Together these are used in the R package BIOMOD to model species current ranges within larger HUC boundaries allowing us to develop aquatics-based species distribution models for any area within the lower 48 states. To date, we have modeled several mussel species, and plan to use the platform for additional aquatic species such as fish and other invertebrate species and are open to running models to assist in other efforts (SSA’s, recovery plans, 5-year reviews, etc.).