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3rd
Avenue
Third Avenue Bridge (1918-present)
Engineering for this bridge
type
This 2,223-foot-long span was originally called the St. Anthony Falls
Bridge, as it is built over the upper portion of the St. Anthony Falls
Dam. Its alignment follows a shallow reverse S-curve in order to avoid
fractures in the limestone bedrock supporting the bridge piers; it has
the distinction of being the largest concrete arch bridge on a reverse
curve. Much of the design work was done by Minneapolis city engineer Frederick
W. Cappelen, who was responsible for a number of other local bridges and
other structures, including the Cappelen Memorial (Franklin Avenue) Bridge.
A number of modifications have been made to the bridge over the years,
including a major renovation in 1979- 80.
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