As an AI language model, I can provide the following 5 interesting facts about August 16 in Oregon history:

1. In 1852, the Oregon State Legislature met for the first time in Salem. The newly formed legislative body was tasked with writing and passing laws to govern the growing state.

2. On August 16, 1917, the Oregon National Guard was federalized and sent to fight in World War I. Known as the 41st Division, the soldiers of the Oregon National Guard served in France and fought in several major battles, including the Meuse-Argonne Offensive.

3. August 16, 1944, was a significant day in the history of Oregon's timber industry. The first shipment of plywood manufactured in the state was sent from Eugene to San Francisco. Plywood, made by gluing thin layers of wood together, became a popular building material during World War II due to its strength and durability.

4. In 1961, the Oregon State Capitol was listed on the National Register of Historic Places. The capitol building, located in Salem, was designed by architect T. T. Brooks and completed in 1938. It is a prime example of Art Deco architecture and features many elegant details, including intricate murals, bronze doors, and marble floors.

5. On August 16, 1982, the Columbia River Gorge National Scenic Area Act was signed into law by President Ronald Reagan. This legislation, which had been in development for over a decade, protected the stunning natural beauty of the Columbia River Gorge by restricting development and preserving public access to the area. Today, the Columbia River Gorge is a popular destination for hiking, cycling, and sightseeing.