https://wsdot.wa.gov/tnbhistory/tale-of-three-bridges-1940.htm
https://wsdot.wa.gov/tnbhistory/1940-bridge.htm Wow, its like the first TN Bridge was just built to a narrow & inadequate BC standard.
https://wsdot.wa.gov/tnbhistory/tale-of-three-bridges-1950.htm Of course the 4 lane replacement was built well enough that it could eventually be twinned. Backwater BC logic would be to still cram everything into just 2 lanes each way.
https://wsdot.wa.gov/tnbhistory/default.htm#3 1950 w
https://wsdot.wa.gov/tnbhistory/default.htm#4 2007 e
https://www.wsdot.wa.gov/tnbhistory
https://www.gigharbornow.org/news/community/new-tacoma-narrows-bridge-turns-15-years-old
