1842 "August 23.—Yesterday evening we reached our encampment at Rock Independence, where I took some astronomical observations. Here, not unmindful of the custom of early travelers and explorers in our country, I engraved on this rock of the Far West a symbol of the Christian faith. Among the thickly inscribed names, I made on the hard granite the impression of a large cross, which I covered with a black preparation of Indiarubber, well calculated to resist the influence of wind and rain. It stands amidst the names of many who have long since found their way to the grave, and for whom the huge rock is a giant gravestone." From John C. Fremont's account in Report of the Exploring Expedition to the Rocky Mountains, 1842.
1867 Cheyenne Post Office was established as Cheyenne City Post Office on August 22, 1867 in Dakota Territory prior to the formation of Wyoming Territory.
1883 During his 1883 trip to the Grand Tetons and Yellowstone National Park, President Arthur and his party spent a lot of time fishing for trout in the rivers of northwestern Wyoming. On August 22, they spent the day fishing the Snake River.