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**Authors**: Ahmet Artu Yildirim (firstname.lastname@example.org) **Abstract**: Environmental researchers, modelers, water managers, and users often require access to high performance computing (HPC) resources for running data and computationally intensive models without being an HPC expert. To remedy this, science web portals have been created that integrate scientific models, data analysis, and tools to visualize results via web browsers. in this study, we present a general-purpose science gateway service named HydroGate created to access hetero- geneous HPC storage and computational resources. HydroGate abstracts away many details and complexities involved in the use of HPC systems including authentication, authorization, data and job management, and encourages the sharing of scientific applications and promotes collaboration among scientists via unified access to HPC centers. HydroGate has been developed as part of the CI-WATER project which aims to broaden the application of cyberinfrastructure (CI) and HPC techniques into the domain of integrated water resources modeling. HydroGate is capable of dealing with various batch job schedulers and CI storage systems through a JSON-based manifest. **Acknowledgement**: Funding for this work, by the U.S. National Science Foundation under grant EPS 1135482 is greatly appreciated. Any opinions, findings and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation.