Hassayampa River near Morristown, Arizona View from cableway looking upstream during flood of February 9, 1993. The disturbance is a wave propagating slowly downstream, under upper-regime (high-Froude number) flow conditions. (Credit: Phillips J. V., and T. L. Ingersoll, U.S. Geological Survey Professional Paper 1584).

Hassayampa River near Morristown, Arizona View from cableway looking upstream during flood of February 9, 1993. The disturbance is a wave propagating slowly downstream, under upper-regime (high-Froude number) flow conditions. Photograph taken soon after previous photo. (Credit: Phillips J. V., and T. L. Ingersoll, U.S. Geological Survey Professional Paper 1584).