1. On August 5, 1918, the Oregonian reported that the death toll from the Spanish flu epidemic had risen to 3,000 in Oregon. This was a particularly deadly outbreak of the flu, which infected a third of the world's population and killed an estimated 50 million people worldwide.

2. August 5, 1930 saw the dedication of the mosaics at Timberline Lodge on Mount Hood. These mosaics were designed by renowned artist and author, C.S. Price, and depict Oregon's flora, fauna, and Native American culture.

3. On August 5, 1956, the first official auto ferry service across the Columbia River started between Astoria, Oregon and Megler, Washington. The ferry service continued until the completion of the Astoria-Megler Bridge in 1966.

4. August 5, 1962 marked the opening of the Oregon Museum of Science and Industry (OMSI) in Portland, Oregon. OMSI is a leading science center and educational resource for both children and adults.

5. On August 5, 1991, the Dalles Dam on the Columbia River was declared a National Historic Landmark. Built in the 1950s, the dam not only generates electricity but also provides flood control and navigation for the Columbia River.