Photo taken by Luis Pumarada
View this photo at en.m.wikipedia.org
BH Photo #276480
Further research uncovered the following from a NRHP MPS .pdf
Said .pdf: https://npgallery.nps.gov/NRHP/GetAsset/NRHP/64500544_text
Considering there are several lattice girders scattered across Puerto Rico that were constructed by Eugene Rollin & Co., also of Braine-le-Comte, Belgium, I'd say that furthers my suspicions.
I would have to do a little more research, but off the top of my head, I can add to the conversation that Pont Turcot in Quebec http://historicbridges.org/bridges/browser/?bridgebrowser=qu... was built by a Belgium company: Société Anonyme Internationale de Construction et d'Entreprises de Travaux Publics of Braine-le-Comte, Belgium. The company name translates via Google to "Anonymous Society International Building and Construction Companies" but somewhere I figured out a more accurate translation would be "International Engineering and Construction Company Limited." Given the name of the company I suspect they may have done business in other places too, perhaps here.
I finally found a bit of info on Spanish Wikipedia that gives us a lead on who built the bridge, stating that construction work was subcontracted to the "Société d'Entreprises et des Constructions des Colonies Espagnoles"
And from there on, everything is in French, and my French is even more rudimentary than my Spanish is...
Then there's this Google Books lead that mentions that Belgian bridges could be had for 2/3rds the cost of an American span, which leads me to believe the French subcontractor was ordering Belgian bridges, probably from the same manufacturer that constructed all of the extant Lattice Girders.
Anyone have any insight? I know Nathan and Jason have done more work in Europe than anyone else.
Spanish Wikipedia link: https://translate.google.com/translate?hl=en&sl=es&u=https%3...
Google Books link: https://books.google.com/books?id=Y-RsAAAAMAAJ&pg=PA393&dq=P...
Sad news, one span was lost to Hurricane Maria: