The Lewis and Clark Expedition begins construction of Fort Clatsop on December 9.
The officers of the Racoon and the men of the North West Company formally claimed Fort Astoria and the surrounding countryside for the British crown on December 13.
The first steamboat built on the Willamette River, the Lot Whitcomb, is launched from Milwaukie on December 25.
George Flavel (1823-1893), a sea captain and businessman, attempts to rescue forty-two people from the General Warren, which sank off the coast of Astoria.
Edward D. Baker (1811-1861), a Douglas Democrat and close friend of Abraham Lincoln’s, takes his seat in Congress as the senator from Oregon.
The Champagne Riot broke out in Douglas County on December 25.
Wilhelm Keil (1812-1877), the leader of the Aurora Colony, dies.
Louise Mohan Bryant (1885-1936), journalist and wife of John Reed, is born on December 5.
A group of real estate developers, led by Zephen Job and Miles Wilkins, incorporate the Corvallis Street Railway Company on December 17.
A federal grand jury in Portland indicts John Mitchell on December 31, charging that he had accepted a bribe in exchange for influencing the General Land Office to approve fraudulent homestead patents.
Governor Oswald West orders Baker County Sheriff Ed Rand to close Copperfield’s three saloons by December 26 in response to charges of illegal liquor sales and gambling.
Workers at the Puget Sound Navy Yard in Bremerton, Washington, launch the heavy cruiser Astoria on December 16.
President Franklin D. Roosevelt signs an executive order establishing the Hart Mountain National Antelope Refuge on December 21.
The Portland City Council creates the Housing Authority of Portland (HAP) on December 11 to rebuild the city's rundown housing and to create new housing for the war workers.
The Portland Symphonic Choir, led by C. Robert Zimmerman, performs its first major concert.
John Litster, the founder of Oregon Vortex and House of Mystery in Gold Hill, dies on December 4.
The Oregon Lumber Company sells the Bates mill and townsite to the Edward Hines Lumber Company on December 30.
Cutler City votes to join Oceanlake, Delake, Nelscott, and Taft to form the municipality of Lincoln City.
The Land Conservation and Development Commission (LCDC) adopts the state planning goals, as directed by Senate Bill 100.
Clyde Drexler (1962-), who played for the Portland Trail Blazers from 1983 to 1995, scores his ten thousandth career point on December 26.
Keiko, an orca whale who lived for a time at the Oregon Coast Aquarium, beached himself and died of pneumonia on December 12.
Floodwaters rise in Vernonia, destroying and damaging hundreds of buildings.