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.
NO. 422 SONORA-MONO ROAD - Jedediah Smith is reputed to have been the first white man to cross over or near Sonora Pass in 1827. A portion of the road was built by Tuolumne County Water Company in 1852 and a toll gate, fine hotel, and stables were located near this spot in the 1850s. Surveyed to Bridgeport, Mono County in 1860, the road was completed in 1864, when a six-horse team took three weeks for the round trip between Sonora and Bridgeport.