The Derby, US 5 connector, Bridge 1 project will replace the bearings, structural steel, deck, pavement and railing on existing bridge. One of the supporting piers will be removed and the cap beams on the remaining three piers will be rebuilt. The existing abutments will be retained.

The existing Derby, US 5 connector , Bridge 1, is a five-span, two lane structure which was constructed in 1962. The existing spans are not continuous across the piers, which leads to leakage at the joints at the piers. The bridge railing is aluminum railing, which was installed in 1991. This type of railing is no longer used and is considered to be sub-standard. The bridge is 315 feet in length and it is 38 feet wide. It includes two travel lanes for vehicles and a sidewalk on the north side. The bridge superstructure, which is a concrete deck on painted steel beams, is in poor condition.

The new bridge superstructure will be a paved concrete deck supported by un-painted steel girders. The girders will be continuous across all four spans of the rehabilitated bridge. The new bridge rail will be made of galvanized steel tubing. On the bridge there will be two travel lanes and two wide shoulders for pedestrian and bicycle use.

During construction Bridge 1 will be closed. Traffic using Caswell Avenue to cross the Interstate will be directed down the I-91 on ramps to a temporary traffic signal. The signal will stop north and south bound traffic on I-91 periodically to allow cross traffic from Caswell avenue to proceed.  Left turns from I-91 are not allowed. Northbound I-91 traffic traveling to Derby Line needs to use exit 28 and follow detour signs along US Route 5. Southbound traffic along I-91 traveling from Canada to Holland is detoured to exit 28 to I-91 northbound.