We collected over 400 zoobenthic core samples with a 250μm sieve and physicochemical data around mid-channel bars between flow pulses over a 4-month period in summer 2007.  Flow pulses changed sandbar shape, coarsened substrate composition (by washing away small particles), and altered the number and distribution of channels.  The main taxa found were chironomids of various sizes, ceratopogonids, and some oligochaetes.  Invertebrate communities showed recovery lag times proportionate to the magnitude of the flow pulse.  However, downstream displacement was more complete in areas of high hydraulic stress (leading edge of bars), whereas communities resisted displacement in areas of flow relief.  Understanding roles of hydrogeomorphic fluctuations continues to be important; especially with climate models predicting increased precipitation variability in the Great Plains.