| 1851 | Mariposa Battalion discovered Yosemite
Valley from Inspiration Point. |
| 1855 | J. M. Hutchings organized first party of
sightseers to enter Valley. |
| 1856 | "Lower Hotel," first permanent
structure, built at base of Sentinel Rock. |
| 1858 | Cedar Cottage built. |
| 1864 | Yosemite Valley and Mariposa Big Trees set aside
as park by Congress, to be administered by State of California. |
| 1868 | John Muir made his first trip to area. |
| 1871 | Conway started work on Four-Mile
Trail to Glacier Point. Finished in 1872. |
| 1874 | Coulterville Road built to Valley floor. Big Oak
Flat route completed to Valley. |
| 1875 | Wawona Road constructed to floor of Valley. |
| 1876 | Sentinel Hotel built. |
| 1881 | Tunnel cut through Wawona Tree. |
| 1882 | Tioga Road constructed. Conway built Glacier Point
Road. |
| 1890 | Yosemite National Park, surrounding Yosemite
Valley, created October 1. |
| 1891 | Capt. Wood, first superintendent, arrived with
Federal troops to administer park, May 17. |
| 1899 | Camp Curry established. |
| 1900 | Holmes brothers of San Jose drove first automobile
into Yosemite. |
| 1906 | Yosemite Valley and Mariposa Grove receded to
United States. |
| 1913 | Automobiles admitted to Yosemite Valley. |
| 1914 | Civilian employees replaced military in
administration of park. |
| 1919 | First airplane landed in Valley, May 27,
Lt. J. S. Krull, pilot. |
| 1926 | All-Year Highway completed and dedicated July 31. |