Sound Beach Avenue Bridge (No. 03954)

Public Hearing Notice  click here

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


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

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 concrete box culvert span, which create 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 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 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 4 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 last 2‐3 years.

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 construction in a scenic road 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 Power Point slides of 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 Power Point slides of the Presentation- CLICK HERE   

To View Hearing Decision- CLICK HERE

Anticipated Project Timeline

Fall 2019/Winter 2020 – Semi-Final Design and Coordination with utilities for proposed relocations.

Fall 2020 – Final Design Submission and Submission of Required Permits (IWWA, CTDEEP, ACOE, P&Z (CAM and Scenic Road))

 Winter 2020 –Advertise Construction to Bid

Winter 2020 – Begin Construction

Winter 2021 – Complete Construction

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