I'm just showing two of the several bridges in the Quad Cities. (my photos)
Centennial Bridge (1940) between Davenport and Rock Island.
I cross this one every day.
Formerly called The Memorial Bridge, this twin-span suspension
between Moline and Bettendorf is now just called the I-74 bridge.
One span was completed in 1936 the other not until 1959.
Being that both spans are way too narrow for an interstate bridge, plans are in the making for its replacement (around 2015)