Both! Built 1927, widened 1974. From the NR for the Carriage Paths, Bridges and Gatehouses of Acadia National Park:
“This bridge was the object of a 1974 widening project that expanded the upper deck to accommodate Route 233 traffic and which received engineering awards for the division, the
separation move made on a system of ball bearings, and the excellent reseaming with
the newly added masonry.” #geekwentandlookeditup
Preservation in Pink 
Both! Built 1927, widened 1974. From the NR for the Carriage Paths, Bridges and Gatehouses of Acadia National Park:
“This bridge was the object of a 1974 widening project that expanded the upper deck to accommodate Route 233 traffic and which received engineering awards for the division, the
separation move made on a system of ball bearings, and the excellent reseaming with
the newly added masonry.” #geekwentandlookeditup
thanks for the information! I was wondering if these bridges had been widened.