If you look to the right of the white buildings above and just east of the trestle, you can see the remains of another, shorter trestle
I have A Images Of America book on Reedsport I cant find it right now but I do recall seeing a picture of a trestle near Winchester Bay but I cant remember the company.
Some times they did and sometimes they did not it all depends on the map.
Looking at historic topo maps, I don't see any railroads there. Did logging railroads end up on topos?
You can follow the grade leading to the trestle sight on the state of Oregon's Lidar page into Reedsport. I was unable to find which specific logging railroad built the railroad, but I was able to compile a list of lumber companies which may have had logging railroads out of Reedsport. Balderidge Logging Co. 1931-1938, C. Mc. C. Johnson Lumber Co. 1921-1928, Elrod & Wills Lumber Co. 1929-1930, Umpqua Mills and Timber Co. 1924-1934, Winchester Bay Lumber Co. 1920-1936, and H-K Logging 1922-1929.