Almost inaudible: A leaf falling: 20: Audible: Rustles of autumnal leaves: 30: Very quiet: Whispering: 40: Living room, quiet classroom: 50: Limited sound: Refrigerator working, car driving past: 55: Percolating coffee-maker: 60: Audible: Sound of human voice, machinery: 70: Irritating: Television set on loud, vacuum cleaner, several people on the telephone: 75: Constant sound
The Dominguez-Escalante expedition was the first on it, traveling from Utah Lake to present-day Scipio. Jedediah Smith traveled most of it in 1826 and 1827, and other trappers, including Ewing Young, Kit Carson, and Peter Skene Ogden, followed. John C. Fr?nt mapped the country up to Utah Lake in 1844, and in 1848 Miles Goodyear took a pack train over the entire Salt Lake-Los Angeles route.
It provided a route for the California Trail to the gold fields after 1849 but had been used by 1841 as a California branch of the Overland Trail. In 1826 famed Trapper Jedediah Smith traced the southern route through the Great Basin to Los Angeles and found his way back across the heart of the Great Basin in 1827. He disproved the existence of the mythic Rio Buenaventura that was said to flow to the sea and which had appeared on many previous maps.