Sound Beach Avenue Bridge (No. 03954)

Road Closure Alert:

The Sound Beach Avenue Bridge will be closed this Monday (9/19) from 7 AM to 5 PM due to bridge culvert installation work. Vehicles will be detoured to Harding Road and Forest Avenue. Please give yourself a little extra time when traveling, follow posted detour signage, and obey police directions. This work is part of a crucial project to replace a deteriorating bridge used by approximately 14,500 vehicles daily. 

Vehicular Detour Route

Highlighted Detour Route Google Maps Version

Pedestrian Detour Route

Pedestrian Detour Route

Project Update: 

After July 1, 2022, the road has been opened to two-way traffic with one lane in each direction. Work after July 1, 2022, will utilize alternating one-way traffic during work hours with the help of police or flaggers and two-way traffic outside of work hours.

Although the road is open for traffic, the remaining culvert sections will be installed this summer in conjunction with utility relocation. Potential intermittent traffic is anticipated. Please give yourself a little extra time when traveling, stay vigilant for signage, and obey police directions. For the safety of the workers,  stay alert, slow down, and select alternative routes. Pedestrians will be routed through Binney Park during construction. The pedestrian detour will remain in effect until the sidewalks are completed. Follow @GreenwichPublicWorks on social media for the most recent updates. 

The Sound Beach Avenue Bridge project is scheduled to be completed in Fall 2022. 

Replacement of Sound Beach Avenue Bridge (Bridge No. 03954)


Sound Beach Ave- pic 1Sound Beach Ave- pic 2

Anticipated Project Timeline

  • Fall 2022 -- Major bridge construction and project completion 
  • July 1, 2022, -- 2/3 of the pre-cast concrete culvert sections have been installed, road reopens and vehicular detour ends 
  • April 11, 2022 -- Major construction began with a full detour in place  
  • Fall 2021 – Contract awarded to A. Vitti Excavators, LLC.

Project Introduction

The existing Sound Beach Avenue Bridge was built in 1925 and rehabilitated in 1977 while adding an additional culvert to the south to relieve flooding. The current structure consists of 2 spans, a concrete deck span, and a concrete box culvert span, which creates a center pier. The existing bridge is located adjacent to Binney Park in Old Greenwich and it has a deteriorated stone masonry fascia. It has rated poorly during the last series of inspections and is recommended for immediate replacement. A most recent routine and underwater inspection concluded that the bridge had continued to deteriorate and the superstructure showed the most damage with exposed rebar, cracking, spalls, honeycombing, and scale on the concrete slabs. If the deterioration continues and is rated at 3 (critical), a load rating restriction will have to be in place which will restrict a majority of truck traffic. The Average Daily Traffic (ADT) in 2017 was approximately 14,500 cars per day.

Project History

Upon notification of the bridge’s poor rating, the Town began to gather preliminary information and seek grant funding for the bridge design and replacement. The Town hired Weston and Sampson, Consultant Engineers, and TranSystems, Traffic Engineers to complete a preliminary assessment of the bridge and surrounding area. A preliminary bridge design assessment requires that the existing roadway and adjacent intersections are reviewed to make sure that they meet the most recent Federal Highway Standards for Roadway Design. Also required is a review of the accident history, emergency access, turning movements, compliance with the most recent Manual on Uniform Traffic Control Devices (MUTCD) standards, and FEMA 100-year flood capacity requirements.Sound Beach Ave- pic 3

This assessment concluded that the current configuration at the intersection of Sound Beach Avenue/Laddins Rock Road/Harding Road is not compliant with the Federal Highway Standards (FHWA). Additional review of crash history data during the design process recommended improvements to the intersection of Sound Beach Avenue and Forest Avenue. Additionally, this area was flagged by the Town’s Flood and Erosion Control Board (FECB) and Emergency Services as an area prone to flooding. This area is listed as a high-priority project under the FECB to mitigate flooding caused during high tide and extreme rain events. Emergency Services flagged this area because emergency vehicles are prohibited from passing through the intersection of concern during large storm events.

Three Public Meetings were held, between 2013 and 2018 to present the issues and recommendations noted above. A Municipal Improvement was denied by the Planning and Zoning Commission causing the Town to move forward with only the bridge replacement.

The State of Connecticut provided the Town with a commitment to fund through the Local Transportation Capital Improvement Program (LOTCIP) in the amount of $3.9 million dollars.

Project Overview

The existing bridge will be replaced by a single-span precast concrete structure with masonry facing which will match the look of the Wesskum Wood Road Bridge and pedestrian bridges within Binney Park with rounded stones, deep grout, and capstones. The new design will eliminate the center pier which will increase the hydraulic efficiency of the bridge. The bridge can be constructed utilizing Accelerated Bridge Construction (ABC) techniques. This could significantly reduce the road closure time to approximately 3 months. If the road were to remain open to alternating one-lane traffic, it is anticipated the project could take one year to complete.

The proposed structure will have a masonry fascia to match the existing look and to flow with the park setting and surroundings. The elevation of the bridge will change.

The bridge serves three purposes – supporting traffic traveling on Sound Beach Avenue, allowing water to flow from Cider Mill Brook into Binney Pond, and allowing pedestrians to safely travel to and from their destination. The bridge replacement will ensure that all of these functions can continue for years to come.

Funding for Construction has been requested through the Capital Budget Process for Fiscal Year 2020/2021 and granted in the amount of $3.5 Million.

The temporary traffic and pedestrian detour will be the most noticeable impact of this project. Both detours will be posted with signage and last approximately 3 months. For vehicles, it will utilize Harding Road and Forest Avenues. Local driveway access will be maintained throughout construction. For pedestrians, it will utilize the existing crosswalks in the vicinity and the existing sidewalks through Binney Park. It is anticipated that the total project duration will be approximately 1 year.

Existing utilities, such as sewer, drain, water, communication lines, and gas will be temporarily relocated prior to the removal of the existing structure.

IWWA Permit received on October 26, 2020
ACOE Permit received on November 10, 2020
P&Z CAM approval and recommendations for the construction of a scenic road were received on November 17, 2020
DPW Public Hearing held on December 3, 2020

Sound Beach Avenue Bridge Public Information Webinar – May 2020

To view a narrated version of the webinar CLICK HERE  (please note this will take you to a YouTube video).

To view PowerPoint slides of the Webinar - CLICK HERE

DPW has created a list of Frequently Asked Questions - CLICK HERE to view this document - Check back weekly for possible updates to this document.

Sound Beach Avenue Bridge Public Hearing- December 2020

To View PowerPoint slides of the Presentation- CLICK HERE   

To View Hearing Decision- CLICK HERE

Contact: Gabriella M. Circosta Cohee, P.E., Senior Civil Engineer
DPW – Engineering Division
E-Mail: gcohee@greenwichct.org
Phone: 203-861-3151