Forty two warmwater streams, evenly distributed between the Highland Rim and Ridge and Valley ecoregions of Tennessee, were chosen for a two-year study, to determine what, if any, effects bridge re-construction activities have on benthic invertebrate communities in these ecoregions. Each stream was categorized into one of three age classes, based upon bridge reconstruction completion date, and sampled during spring and fall 1997 and 1998 using a D-frame kick net and a 33-cm diameter Hess sampler. Preliminary results on spatial and temporal variation do not indicate long-term negative impacts on benthic invertebrates following bridge replacement. Two additional streams, which are currently experiencing bridge replacement, are routinely being monitored. The results of this project will help to determine the extent of degradation during bridge replacement and the amount of time necessary for benthic community recovery.