Our research focuses on macroinvertebrate secondary production and assemblage structure to better understand how wetland management and restoration status relate to biodiversity and ecosystem function.  Macroinvertebrates were collected from main pool areas of Big Lake (BL), a wetland mitigation site with an unmanaged connection to the Illinois River, and  Spunky Bottoms (SB), a highly managed wetland with no direct connection to the river. Tanypodinae and Chironominae dominated both wetlands, but annual production was higher in BL (210.2 g DM m^-2 y^-1) than SB (112.9 g DM m^-2 y^-1).  Biomass estimates were similar between near-shore habitats of BL and SB, but were higher in open-water habitats for BL (1000-7500 mg DM m^-2) than SB (400-1700 mg DM m^-2).  Taxa richness was higher in SB (32) than BL (22), reflecting the presence of mayflies (Caenis sp.), damselflies, caddisflies and snails that did not occur in BL.  Higher taxa richness in SB likely reflects the diverse aquatic plant assemblage dominating SB at the time of the study compared to a lack of aquatic vegetation in BL.  This study will contribute to research currently being conducted along the Illinois River addressing the complexities of restoring and managing floodplain habitats for biodiversity and ecosystem function.