Tyngsborough Bridge

It is also the 2nd oldest steel rib through arch bridge in the state.

The new bridge was sited alongside but not parallel to the older, starting close to the old structure on the eastern side of the river but reaching the western side well away of the old bridge.

[6] Starting in 1975 the bridge was rebuilt, but the cost of the construction generated controversy.

[7] In November 2005, the bridge was closed again for repairs following reports of structural deficiency.

This was partially due to delays with steel girders failing stress tests, which required re-engineering, and the discovery that the original bridge had been constructed with lead paint which required S & R Corp. to take measures to ensure that the paint chips did not fall into the river below.

The Tyngsborough Bridge, as seen from alongside the Merrimack River.