Nationally and Exceptionally Significant Features of the Federal Interstate Highway System
Hernando DeSoto Bridge
(Shelby County, Tennessee)Built 1973Two-span steel through arch bridge over the Mississippi River on I-40 at MemphisClosed due to a crack being found.
I-25 Nogal Canyon Bridge
(Socorro County, New Mexico)Built 1968Parallel deck truss bridges over Nogal Canyon on I-25Open to traffic
(Emmet County, Michigan)Opened Nov. 1, 1957Suspension bridge over the Straits of Mackinac on I-75 at Mackinaw CityOpen to traffic
Memphis & Arkansas Bridge
(Shelby County, Tennessee)Construction began 1945, opened to traffic December 19, 1949 ; Refurbished 1984Cantilevered through truss bridge over the Mississippi River on I-55 at MemphisOpen to four lanes of traffic