Thank goodness for tall trees; it makes building bridges like this a lot easier. This photo of the bridge and three young women (?) was taken in Independence, Oregon. The date was sometime between 1904 and the 1920s, based on the stamp box on the backside. Independence is a small town with a current population of about 6,000 on the Willamette River near Salem, Oregon. This picture was probably taken somewhere along Ash Creek.
Independence was a center for hops growing for several decades, so much so that the population would increase by over 40,000 during harvest season. For some reason production declined in the 1950s, and the influx stopped.
Here's the back of the card.