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Comparison of geo-referred bathymetric datasets from 2000 to 2017, at different timescales, allowed to analyze changes in the sedimentary balance and to determine patterns of morphological adjustment in the Magdalena River (South America). The Magdalena River has one of the highest sediment yields among the major rivers of the world. In addition, it is a laterally constrained river mouth due to a series of man-made structures inhibiting its morphological response. Thus, it provides an illustrative example to study siltation processes in a river mouth system where a low capacity of morphological response interacts with a high-magnitude sediment transport regime. The river mouth exhibited an overall slow-pace deepening trend between 2000 and 2017. However, it experienced cyclic shifts between erosive and siltation states, both at interannual and intra-annual scales. The rates of erosion were 310 …