Blankenship BendBlankenship Bend is a bend on the Colorado River in Mohave County, Arizona, US. It lies at an elevation of.HistoryIn the 19th century, Blankenship Bend formed a horseshoe shaped turn of the river of 180 degrees, that the steamboat men called the Grand Turn, because it was the largest turn on the Colorado River that was navigated by steamboats. It lay above Fort Yuma.