Le district de l'Oregon appartient au département du Pacifique indépendant reconstitué par la consolidation des départements de Californie et de l'Oregon, qui est créé le , lorsque l'armée est réorganisée. Le district est créé le même jour, et comprend le même territoire que l'ancien département de l'Oregon, l'État de l'Oregon (sauf pour les régions de la rivière Rogue et de la rivière Umpqua dans le sud de l'Oregon) et le territoire de Washington, avec les quartiers généraux se trouvent au fort Vancouver dans le territoire de Washington.
Le , le district comprend le territoire de l'Idaho après avoir été formé à partir de la partie orientale du territoire de Washington. Le , le district de l'Oregon est étendu à l'ensemble de l'État de l'Oregon[1].
A two-story blockhouse built to protect the Siletz Indian Agency. It was a subpost of Fort Hoskins. Originally called Yaquina Bay Blockhouse (1856–1858) located at the mouth of the Yaquina River(en) near South Beach. It was dismantled and floated upriver in 1858. Located at Siletz, Oregon.
Garrisoned by the Oregon Volunteer Cavalry to observe Confederate sympathizers in nearby Jacksonville, Oregon. Located one-half mile west of Phoenix, Oregon. Possibly also known as Camp Phoenix.
A temporary state militia post that lasted only one month. Located at the mouth of the Clackamas about one mile north of Oregon City. Replaced Camp Barlow.
Post at Cape Disappointment was at the north mouth of the Columbia River, Washington Territory, later renamed Fort Cape Disappointment 1864 and Fort Canby(en) in 1875.
Carey, History of Oregon, pg. 671. This camp, named for Oregon's representative in Congress at that time, was established early in 1864, near the mouth of Jordan Creek, 330 miles from Walla Walla, and was the center of operations in Southeastern Oregon for some time afterward.
Carey, History of Oregon, pg. 671. North of Harney Lake. A temporary state militia encampment on the Silvies River, possibly to the south of Burns, Oregon. Originally Adobe Camp (1865), a 25-yard square sod-walled post, was located here before being replaced after only two weeks.
Carey, History of Oregon, pg. 671. Located east of Warner Lakes. A Federal camp originally located 20 miles east of Warner (Hart) Lake. It was moved in 1867