This data release contains inputs and outputs needed to reproduce the findings for the publication: Rosa, S.N., and Hay, L.E., 2017, Fena Valley Reservoir watershed and water-balance model updates and expansion of watershed modeling to Southern Guam: U.S. Geological Survey Scientific Investigations Report 2017-5093, 64 p., https://doi.org/10.3133/sir20175093. Data are provided in several files: 1) the PRMS_2016 folder contains the input files needed to run each of the modeled regions in southern Guam, the calibration data files, and a README_PRMS_2016.txt document that describes the contents of this archive and the execution of the model batch files; 2) the FVR_2016 folder contains the input files needed to run the Fena Valley Reservoir water-balance model and a README_FVR_2016.txt document that describes the contents of this archive and the execution of the water-balance model; 3) a GIS file of the model hydrologic response units, PRMS_2016_HRUs; and 4) a GIS file of the model stream segments, PRMS_2016_Stream_Segments.