NY Route 347 – Phase III

Smithtown, NY


Contract Value:
$36 Million

Project Dates:
April 2016 - November 2017


•Additional travel lane in each direction
•Raised planted meridian barrier, sound wall, pavement reconstruction, street and pedestrian lighting, traffic signals, positive drainage system, relocation of utilities
•Traffic maintained throughout project
•NYSSPE LI 2018 Outstanding Engineering Achievement Award


This Design-Build project included improvements and reconstruction of approximately 1 mile of NYS Route 347 from Terry Road to Gibbs Pond Road in Smithtown, NY. Enhancing vehicular and pedestrian access along the Route 347 corridor included widening the mainline by an additional travel lane in each direction and continuing the shared-use path along the south side and sidewalk along the north shoulder. A positive drainage system was required throughout construction to alleviate existing flooding issues while including installation of additional drainage structures along with design and construction of two additional recharge basins.
The soundwall installation runs parallel to Route 347, mitigating potential vehicular noise from traveling into nearby communities. Raised planted median barrier divides the highway, adding to the greenway boulevard while protecting the traveling public.
The design and construction of the shared-use path green-stop area integrated adjacent properties creating a seamless greenway boulevard utilizing a detailed landscape plan. Other rehabilitations included side-street pavement reconstruction, street and pedestrian lighting, traffic signals, and integration of the Intelligent Traffic-Management System (ITS), along with various site furnishings such as added bus stops, bicycle racks, and benches.
The design-build team worked with many utility companies coordinating the preservation and relocation of existing utilities while installing new gas and water mains to better serve the community. All efforts were made by the design-build team to limit the impacts on the traveling public, local businesses, and the residential community.


The project was to be completed during day-time hours and is in a heavily trafficked commercial area, with businesses that could not be impacted by construction operations. In addition, the traveling public could not be hindered, and lanes of traffic were required to be maintained throughout construction operations. Finally, existing utilities impacted progress of the schedule as they needed to be relocated prior to beginning construction operations.


Posillico staged work to eliminate impacts to the local businesses and maintain access for the traveling public utilizing extensive MPT protocols. A designated Utility Coordinator was identified for the contract, and they maintained a coordination schedule to make sure all contract milestones could be properly met.