Thomas's research assessed the differences in terrestrial invertebrate and benthic macroinvertebrate (BMI) composition, biomass and abundance found in drift and benthos as well as in diets of juvenile Chinook salmon from two sites on the upper Trinity River, below Lewiston Dam. Further comparisons were made between daily and seasonal (February-April) variation found in drift and benthos and diets. The data collected will help to inform future research on the potential of experimental flow pulses released from Lewiston Dam to increase BMI drift forage abundance and other food resources available to juvenile Chinook salmon.