Iowa is noted for an unexpectedly large and diverse collection of historic bridges in the country, and at one time had the most historic bowstring truss bridges, while also having numerous 19th century pin-connected metal truss bridges of all kinds. Reportedly this is because Iowa was expanding in population at roughly the same time as these more durable iron truss bridges came onto the market, so large numbers of long-lasting metal truss bridges were constructed rather than timber bridges that would not have lasted over 100 years. Many of Iowa's most important historic bridges have not been preserved and have been demolished or collapsed. Some preservation has occured as well, however.
Select a location to view a list of bridges. Locations shown in blue have listings.