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Emery County, Utah, United States (38.98448 -110.80385)
In 1853 John W. Gunnison, an Army Topographical Engineer came through Castle Valley, plotting a railroad route. He was commissioned for this assignment by US Secretary of War Jefferson Davis. He left detailed descriptions of his travels, and carefully laid out his route through Castle Valley. Gunnison's route first met the Spanish Trail at the Green River crossing. He followed this trail for a short distance west of the Green River, but when the Spanish Trail entered a rugged rocky region (Sinbad Reef) he charted a route around this feature.