For further clarification, the westernmost through span which had previously served as the swing span prior to the installation of the center vertical lift span no longer functions as a draw span. The rails have been permanently welded together and the swing mechanism has been permanently disabled. All marine traffic that cannot travel under the bridge must use the center lift span.
I worked for the southern Pacific,union Pacific and the present owner b.n.s.f.railway.U.P.only aquired this portion of the railroad for a short period and under government regulation spun it off to the bnsf.in the early 19th century it was a swing bridge with the opening being on the Berwick side of the river. It was later modernized to a lift bridge with the opening more to the middle of the river.I've operated bridges for 3 railroads since 1980. Enjoyed your pictures