sentences:  The first Fort Lewis army post was constructed in Pagosa Springs, Colorado, in 1878, and was relocated in 1880 to Hesperus, Colorado, on the southern slopes of the La Plata Mountains.In 1891, Fort Lewis was decommissioned and converted into a federal, off-reservation Indian boarding school.In 1911, the fort's property and buildings in Hesperus were transferred to the state of Colorado to establish an "agricultural and mechanic arts high school."