According to former West Lynn major Alice Norris:
The photo is from our annual 9/11 ceremony, a silent remembrance of the September 11 attacks. The City of West Linn originally initiated and planned the event and Oregon City co-hosted it until last year when we held no ceremony since the bridge was under construction. The City of West Linn bought the flag and ODOT placed the hardware on the bridge that holds that flag, and ODOT workers unfurl and remove the flag each year. It hangs for about a week. … The short ceremony usually involved a bagpiper playing ‘Amazing Grace’ on the bridge as traffic was stopped at 9 am; the two communities meeting in the middle of the bridge; the unfurling of the flag; the mayors of the two cities throwing wreaths into the river, and community members, students and others tossing flowers into the river….all wordless, a silent tribute. I always found it very moving and beautiful. One year (it might have been 2004), someone stole the flag, and a students from a charter school in West Linn raised money to purchase a new flag.