Grassy Point Road Bridge Replacement

Upon McLaren Engineering Group’s inspection of Grassy Point Road Bridge, also known as Beach Road, over Minisceongo Creek in the Town of Haverstraw in Rockland County, New York, it was discovered that a complete replacement of the bridge was vital to mitigate safety concerns for motorists, cyclists, and pedestrians. Working with the County of Rockland, McLaren engineered a modern bridge design loaded to meet all standards for New York State including HL-93 loading.

Grassy Point Road Bridge Inspection

The bridge inspection performed by McLaren revealed concrete spalling and delamination along the bridge fascia. Additionally, it showed concrete spalling undermining the railing supports and severely corroded girders. This included significant girder bottom flange deterioration. The deterioration and deficiencies discovered resulted in the structure having a reduced weight limit.

Bridge Replacement

Grassy Point Bridge is part of New York State Bicycle Route 9, that runs from Central Park in NYC all the way to Canada. The steel multi-girder bridge was designed to carry, two 11-foot wide vehicle lanes with 4-foot wide shoulders. The single span modern structure capable of carrying all legal loads rests on abutments supported by micropiles.

The McLaren Difference: Applied Ingenuity

In lieu of a typical public information meeting and in response to the COVID-19 pandemic, McLaren worked with the client to provide a mechanism for public review for this federally funded project. The project plans and alternatives were made available online for review with public comments, concerns, and suggestions.

Since the new Grassy Point Road bridge is built adjacent to the existing bridge, McLaren found the original concrete abutments could stay in place as is and didn’t interfere with the new design, saving the project time and money.

To show the client a 360-degree detail and structural analysis of the bridge replacement, McLaren prepared a preliminary design model in LEAP Bridge Steel.

Utility Infrastructure

One of the central challenges revolved around the intricate task of seamlessly integrating the new bridge within the existing underground utility infrastructure. To solve for this, McLaren’s innovative design enabled the bridge abutments to extend over a 42-inch sewer line that traverses the Minisceongo Creek and closely mirrors the alignment of the bridge itself.