References:
https://en.m.wikipedia.org/wiki/North...
https://www.architectmagazine.com/pro...
https://mchughconstruction.com/projec...
https://www.bdcnetwork.com/reconstruc...
https://chicagoloopbridges.com/bridge...

Video References:
   • Video  
   • Center Swing Bridge Opening For A Sai...