種多様性
Species diversity along the canyon bottom is among the highest in the Northeastern United States, with more than 20 species occurring in upper-terrace old growth and approximately 10 more largely restricted to younger floodplains and/or lower terraces. Tree diameters and, especially, heights are superlative. Numerous species exceed DBH, and a dozen or more represent the tallest of their kind in New York State or in the entire Northeast. Most of the gorge's canopy species reach , however several species and individual trees attain greater heights: