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Abstract. Low floodplain wetlands such as the western Everglades in South Florida are vulnerable to extreme weather events, and their water quality and ecosystem functions largely vary depending on changes in water levels and discharges. The future climate is projected to result in increased frequency and magnitude of extreme events, which can negatively affect the hydroecological function of the wetlands. This study evaluated climate change impacts on the runoff and total phosphorus (TP) of natural (L28 Gap) and managed (L28) wetland watersheds in the Western Everglades. For the assessment, we employed future climate projections made using 29 Global Circulation Models (GCMs) and a watershed loading model, Watershed Assessment Model (WAM). The watershed loading model was calibrated and validated for the baseline period (2000 – 2014), and the bias-corrected climate projections were incorporated into the model to project the runoff discharge and TP loads for the near-future (2030 – 2044) and far-future (2070 – 2084) periods.The impacts of projected climate changes on daily runoff and TP loads were limited by water control facilities and practices in the managed watershed, highlighting the importance of watershed management practices for improved water quality under projected climate change. This study demonstrated how global-scale changes could differently affect the hydrology and water quality of the local natural and managed wetland watersheds, which is expected to help develop effective climate change adaptation plans to improve the sustainability of the Greater Everglades System.