Was the builder in question on this one? This bridge has patented Keystone Columns so I don't think there is a mystery here.
Chet,
There is no question that this one is Keystone Bridge Co. I have a picture of it in its original location.
Regards,
Art S.
NRHP Nomination Attached.
Nathan--
Pine Creek Park Bridge was definitely a Keystone Bridge. I only referred to it to illustrate that Keystone was a presence in Connecticut at that time. I still believe the evidence is on the side of Keystone being the fabricator of the Riverside Avenue Bridge. We can all agree more research is needed.