The New Jersey Turnpike Authority (NJTA) maintains the parkway along with the New Jersey Turnpike.
According to the GSP historical records, the parkway was designed to be more than just a road, it was to be a driving experience like no other. Unlike many roads built before and after, it blended functionality with the sense of freedom and adventure. At the time of its construction, the GSP was a symbol for the strength of American infrastructure and economic opportunity. It is now recognized as a historically significant resource by the New Jersey Historic Preservation Office.
In 2019, the NJTA identified two, large failing culvert structures at Mile Posts (MP) 117.4 and 117.85, in Monmouth County that conveyed the Little Luppatatong Creek under the parkway.
McCormick & Taylor (MT) of Mount Laurel, NJ, was tasked with conducting initial field inspection, alternative analysis, and final design, in order to determine whether to rehabilitate or replace the culverts.
MT was also tasked to perform the required hydrologic and hydraulic (H&H) analyses to obtain the Flood Hazard Area (FHA) and Freshwater Wetland (FW) permits.
The culvert under the southbound lanes at (MP) 117.4 measured 180 ft. long with an existing opening of 10’-11″ x 7’-1″ that was originally installed in an arched shape using Corrugated Metal Plate pipe (CMP).
According to a Culvert Inspection Report dated 09/21/2018, the overall condition of the culvert was assessed to be poor. This was due to numerous corrosion holes at the invert of the CMP culvert, and an area of distortion measuring 6” extending for 15 LF located at the crown of the south side of the culvert.