1. In 1940, the Tacoma Narrows Bridge in Washington collapsed due to strong winds during its construction. The event was captured on film and became a famous example of structural failure in engineering classes.
2. On June 29, 1954, the Yakima Valley experienced a record-breaking heatwave with temperatures reaching 110 degrees Fahrenheit, causing widespread power outages and water shortages.
3. The Mount St. Helens eruption on May 18, 1980, continued to have lasting effects on June 29 as heavy ashfalls blanketed Washington cities, causing major disruptions to transportation and daily life.
4. In 1981, the Seattle Seahawks NFL team played their first pre-season game in the newly built Kingdome stadium on June 29, establishing a new era of professional sports in the city.
5. On June 29, 2015, same-sex marriage became legal in Washington state, following the landmark Supreme Court ruling in Obergefell v. Hodges, allowing couples to finally legally wed regardless of gender.