You are looking for a black painted water bottle next to the parking area for Gold Ray Nature Preserve.
I borrowed part of Burlchilds' narrative for a previous catch nearby;
The dam is gone but the history remains, and the future is unfolding as the river reclaims it's natural channel.
You are standing at river mile 125.7, the former site of Gold Ray Dam. The original dam built at this site was a log crib dam constructed in 1904 to divert water for a power generator that provided electricity to a mine run by the Ray brothers. In 1941 the dam was rebuilt using concrete. The concrete dam was 394 feet wide and 40 feet tall. There was a fish ladder, and later a counting station, on this side of the dam which allowed passage of salmon and steelhead, but was considered one of Oregon’s worst fish passage structures.
The dam, powerhouse, and associated structures, along with the surrounding 280 acres were donated to Jackson County by Pacific Power in 1972. The county accepted the liability for the dam in exchange for the lands which were intended to be developed into a park and recreation site. The development of a park never occurred but the dam continued to degrade with time and became a major liability to the county.
In 2010 Jackson County received $6 million dollars from NOAA and OWEB to remove the dam. After a vetting process Slayden Construction was hired to do the removal. By October of 2010 the dam was gone and rehabilitation of the site had begun.