11870b5d_oric_Significance_Rating__HSR___Description
[HSR] 10 [Examples] Brooklyn Bridge, Bollman Truss Bridge, Zoarville Station Bridge, Triple Whipple Bridge, Golden Gate Bridge [Description] 
These are are the quintessential landmark bridges of the country as well as the bridges that are without a doubt the very last of their kind. Bridges in this category are generally all cared for and their wellbeing is often important to the general public.
HistoricBridges.org - Historic Significance Rating (HSR)
Description