Lava Fall Rapids, viewed from the right bank looking toward the mouth of Prospect Canyon. Grand Canyon National Park, Coconino County, Arizona. 1950.

Album caption and index card: Most boatman agree that Lava Falls Rapids, which lies 288.5 kilometers below Lees Ferry, represents the greatest hazard to navigation on the Colorado River. This remarkable photograph was taken of the rapids from the right bank looking toward the mouth of Prospect Canyon. Flow in the river was approximately 1,473 m3/s. The great turbulence created when the water encounters erosional debris from Prospect Canyon is clearly seen. The large dark shrubs in this view were still present in 1976 (see photo trm00068). Some of the shrubs on the opposite bank are desert broom. (Altitude 511 meters). Geologist at left on rock for scale. Grand CAnyon National Park. Coconino County, Arizona. June 19, 1950. (Photo by [...]