Field sampling of aquatic macroinvertebrate communities was conducted to study the effects of sudden flood disturbances following a lull in abnormally persistent spring rainstorms. Despite this disturbance and low collection success, overall diversity was high (Simpson’s index, Ds = 0.87), where pool zones exhibited the greatest diversity (Ds = 0.93) versus riffle zones (Ds = 0.71). Differences in diversity between riffles and pools were significant, suggesting floods disperse macroinvertebrates that occupy niches in the riffle zone. Measures of dominance showed Perlodidae (Plecoptera) was abundant in riffle zones, whereas pool zones were abundant with Chironomidae (Diptera), Baetidae and Heptageniidae (Ephemeroptera). Bottomdown trophic interactions show that flooding appears to have nearly wiped-out primary consumers in the riffle zones, leaving a top-heavy predator food chain. Pool zones were not directly affected by fast currents and exhibited a balanced, trophic pyramid.