One of the brothers looks at Big Drop Three, where the rivers drops 75ft in 3/4 of a mile. Note the size of the man compared to the narrow channel and intense hydrologic power within it. | Source: Northern Arizona University, Cline Library, Special Collections and Archives, Emery Kolb Collection http://archive.library.nau.edu/cdm/ref/collection/cpa/id/15907Download Original File