Benthic macroinvertebrates are widely used as indicators of stream health because their community structure responds to changes in water quality, habitat stability, and hydrologic conditions. This study examined how differing flow regimes influenced by quarry discharge affect stream physical characteristics and macroinvertebrate communities in three headwater streams in northwestern Ohio. Hog Creek represented a natural flow regime, Little Riley Creek received continuous quarry discharge, and Aurand Run experienced pulsed quarry inputs. At each stream, we sampled riffle habitats using a Surber sampler and recorded geomorphic measurements, including depth, width, and current velocity. We identified macroinvertebrates to family level and used one-way ANOVA with Bonferroni post hoc test to analyze differences in physical habitat and community structure. Depth was the only variable that differed significantly among streams, with quarry-influenced sites being deeper than Hog Creek. Diversity and taxa richness did not differ significantly across sites. These results indicate that although quarry discharge alters some physical stream characteristics, these hydrologic differences did not produce measurable changes in macroinvertebrate diversity or richness at the family level. The findings suggest that benthic macroinvertebrate communities in these small streams are resilient to moderate hydrologic alteration or that finer taxonomic or seasonal sampling is needed to detect quarry-related ecological effects.