1. On January 18, 1981, the largest non-volcanic landslide in U.S. history occurred in Benton County, Oregon. Known as the Aldercrest-Banyon landslide, it affected an area of 150 acres and caused damage to homes, roads, and businesses.

2. On January 18, 1859, the Oregon Territory officially became the 33rd state in the United States. It was the first state to enter the Union with a constitution that prohibited slavery.

3. In 1964, the Beach Boys released their hit song "Fun, Fun, Fun." The song was inspired by a trip to Eugene, Oregon, where the band's lead guitarist, Carl Wilson, borrowed his father's Cadillac and picked up a girl for a joyride.

4. On January 18, 1919, the 18th Amendment to the U.S. Constitution was ratified, which prohibited the production, sale, and transportation of alcohol. This led to the rise of bootlegging and speakeasies, and eventually the repeal of the amendment in 1933.

5. In 1993, the first official meeting of the Portland Trail Blazers Fan Association took place on January 18. The fan club was created to support the NBA team and promote fan involvement in the community. It has since grown into one of the largest fan organizations in professional sports.