This dataset provides time series for the ungaged watershed inflows and associated inflow points for the Lower Salinas Valley Hydrologic Models (SVHM), including the Salinas Valley Integrated Hydrologic Model (SVIHM) and the Salinas Valley Operational Model (SVOM). Monthly outflows from watersheds that do not have gages that surround the Salinas River Valley are used in the Lower Salinas Valley Hydrologic models are provided by the Salinas Valley Watershed Model (SVWM) (Hevesi and others, 2025) for the period from October 1, 1967 to September 30, 2018. The streams and tributaries that are not gaged and that are outside the active area simulated in the Lower Salinas Valley Hydrologic Models are provided as basin-wide estimates. The catchments are described as part of the surface water dataset (Henson and others, 2022). The surface inflows provided by the watershed inflows are used as part of the boundary conditions applied at model cells at the interface between outside of the model domain and within the active model domain. This data release contains a time series of input inflows for the 180 ungaged watersheds.