Gravel riffles
It inhabits shallow riffles and runs of small to medium rivers, particularly over small gravel. The assessment considers it likely to bury its eggs in the substrate, but treats that reproductive behavior as probable. Suitable habitat can support locally common populations even though the total distribution is fragmented.
Sources: Etheostoma denoncourti assessment
Habitat changes
Reservoir effects and pollution are identified concerns. The assessment describes losses immediately downstream of Normandy Reservoir while distinguishing healthier populations farther down the Duck River. This illustrates why a river-wide label can obscure important differences between reaches.
Sources: Etheostoma denoncourti assessment
