Project Spotlight: St. Johns Heritage Parkway (Palm Bay, FL)

The WGI Team produced an innovative alternative technical concept (ATC) that converted the preliminary design concept from a partial cloverleaf to a diverging diamond-type interchange.

The St. Johns Heritage Parkway and I-95 interchange project was a design-build project that created a new interchange between a new roadway alignment for St. Johns Heritage Parkway and Interstate I-95 in Palm Bay, Florida.

heritage parkway

Improved Safety and Efficiency

The WGI team produced an innovative alternative technical concept (ATC) that converted the preliminary design concept from a partial cloverleaf to a diverging diamond interchange. This conversion improved the safety and efficiency of the interchange due to the reduction of signal phasing from three phases to two phases.

The conversion to a diverging diamond also allowed the team to provide two narrow bridges in lieu of the preliminary concept’s one wide bridge, resulting in a reduction of bridge deck area.

The eastbound bridge features 4~12’ travel lanes, a 7’ bicycle lane, a 2’-6” shoulder and a barrier protected 12’ shared-use path. The westbound bridge features 3~12’ lanes, a 7’ bicycle lane, and a 2’-6” shoulder. Span lengths provided are 2 @ 115’-3” and one at 99’. Span 1 of the two bridges was required to span over a Florida gas transmission easement parallel to I-95. The bridge abutments are supported on mechanically stabilized earth walls.

heritage parkway

The project also included extensive drainage modifications, including reinforced concrete box culverts and two drainage ponds.

Innovative Concepts

One innovative concept incorporated into the project was the design of the piers in the median of I-95. The foundation piles were designed to straddle an existing drainage trunk line that runs down the middle of the median. This design solution eliminated deep excavation that would have been required to re-route the existing trunk line around the bridge piers.

heritage parkway

Protecting The Environment

During the project, our team carefully mitigated impacts to the surrounding environment. WGI performed gopher tortoise survey and relocation, and the construction team scheduled activities around the breeding season of the Florida Scrub Jay.

heritage parkway

Eliminating Delays

Signing and signals were also included as part of the project. The project team was successful in avoiding a delay as the adjacent project that was to supply the proposed power for the new interchange lighting and signals, was behind schedule. The WGI team proposed a different power source a mile to the south of the proposed interchange to eliminate this delay.

For more information on our Transportation Engineering and Design-Build capabilities, contact us today!

Share this post

Share on facebook
Share on twitter
Share on linkedin
Share on email

Share this post

Share on facebook
Share on twitter
Share on linkedin
Share on email

Related

Motor Carrier Size and Weight Fixed Weigh Stations
Blog

Motor Carrier Size and Weight Fixed Weigh Stations

WGI is entering the second year of our second five-year design support continuing services contract with the FDOT and Motor Carrier Size and Weight (MCSAW). This marks seven continuous years that WGI has provided design services to support the MCSAW objective of preserving Florida’s highway infrastructure.

JOIN THE TEAM

You’ve been searching for a place like WGI. We look forward to meeting you soon.

We're
Nearby

Enter your zip code, and we’ll personalize your experience with local projects, office locations, team members, and more.

WGI's success starts with our Associates

WGI supports its associates with meaningful opportunities for growth, strong benefits and perks, while we work collaboratively with clients and co-consultants to shape and improve communities.

Our Team in Action

Join the Team

WGI is a dynamic organization with opportunities nationwide for engineers, land surveyors, landscape architects, environmental scientists, and architects.