The additional bracing on the outside must have been added 1926 then....
went to the original size on flickr.
Plaque reads as follows
Bridge No. 203
All spans
in this bridge were reinforced
in 1926*
Date is not very clear.
http://www.flickr.com/photos/jayztrainz/4600607126/in/set-72157627170139279/lightbox/
Other side of bridge had plate....