River regulation and water extraction have impacted a range of ecosystem functions and processes in the Murray-Darling Basin including wetting and drying patterns of in-channel banks and benches. Innundation of these areas is hypothesised to be play an important role in productivity of riverine ecosystems both as a source of organic matter and release of microinvertebrates eggs from eggbanks. It currently remains unclear what the potential importance of innundating different in-channel banks heights may be for supporting riverine food web productivity. To address this we conducted a mesocosm study to investigate the productivity contributions from different bank heights of two sites on the Mehi River, NSW. Sediment was collected from three different bank heights, low, medium, and high and added to 1000 L mesocosm in five different bank height treatments combinations. The results showed soils from the high bank heights had significantly higher organic matter content, leaf litter and live plant coverage than those on the lower bank heights. This translated into high concentrations of organic carbon and phosphorus in treatments receiving sediment from higher section of the bank. Chlorophyll a concentrations were low throughout the experiment and were higher in the treatments receiving sediment from lower section of bank. Zooplankton community was dominated by rotifers, copepods, and Cladocera. Zooplankton abundance was low at the beginning of the experiment. In the second half of the experiment zooplankton abundance increased and was higher in the mesocosms that received sediment form the higher and on occasions medium, sections of bank compared to the lower sections. The results indicate that higher bank and bench heights within river channels can support increased food web productivity. Environmental flow rules and consideration of wetting in-channel banks when using held environmental water may be important for maintain and restoring lowland river ecosystems.