At least four bridges have stood at the mouth of Oswego Creek near Oswego Landing over the past 150 years, providing access to Old River Road on the west side of the Willamette River between Oswego and Willamette Falls. The earliest crossings served travelers, and in the 1860s a beam bridge carried foot, horse, and buggy traffic. In 1885 a substantial Howe truss bridge was built parallel to the older beam structure to serve the town's growing population and iron industry. By 1911 the truss bridge had been covered with a roof and walls to protect it from the elements, and it remained in use until the concrete Pacific Highway Bridge was completed in 1920. After that, the covered bridge continued to serve pedestrians until it rotted and collapsed in the 1930s. Following World War II, a replacement bridge was built and remained in use until 1975, when it became unstable and was removed by the National Guard.