sentences:  There is some evidence that American fur trappers may have entered the canyon in the early 19th century, but the first unequivocal sign of a white presence is an inscription on the canyon wall reading "S. Groesbeck August 19, 1867".John Wesley Powell's second Colorado River expedition camped at the mouth of the canyon in 1871, and the earliest appearance of the name "Nine Mile Canyon" is in records of the expedition.Nine Mile Canyon Road (also 9 Mile Canyon Road) was constructed through the canyon in 1886 by the Buffalo Soldiers of the 9th Cavalry Regiment, linking Fort Duchesne to the railroad through the city of Price.