Willis/Woodcrest/Upper Weadley Roads Stormwater Improvement Project

UPDATE: (October 22, 2025): The Township is well into the construction of Stormwater Management and Improvement Project on Willis Lane and Upper Weadley Road.

Work Completed: As of October 22, 2025, the Township contractor, N. Abbonizio, has completed installation of the following items:

• 2 new Storm Inlet Boxes (on Willis Lane and between Willis Lane and Woodcrest Road);
• 3 new Storm Manhole Structures (between Willis Lane and Woodcrest Road);
• 450-LF of new 36-inch HDPE storm pipe (between Willis Lane and Woodcrest Road);
• 32-LF of new 24-inch HDPE storm pipe (between Willis Lane and Woodcrest Road);
• 181-LF of new 8-inch Sanitary Sewer pipe (Upper Weadley Road);
• 2 new Sanitary Sewer Manhole Structures (Upper Weadley Road), &
• Temporary Wooden Access Matting (between Willis Lane and Woodcrest Road)

AQUA has relocated water main and service connections on Arlyn Circle in advance of future Underground Infiltration bed installation and drainage improvements (inlets, manholes, etc.) on Arlyn Circle later in the project.

Upcoming construction activities between October 22, 2025 and November 26, 2025:

• Tree removal in the future Stormwater Aboveground Basin Area (between Willis Lane and Woodcrest Road)
• • Beeghly Tree (subcontractor) to N. Abbonizio; work to begin around October 22, 2025 and continue through November 5, 2025, depending on weather.

• Storm Drainage Pipe Improvements (On-Going Construction)

Residents should be advised that during the above reference work, Upper Weadley Road will be closed to all through traffic.  Local residents will still be able to access their properties on Upper Weadley Road and on all the streets off Upper Weadley Road, from either Old Eagle School Road (to the east) or West Valley Road (to the west). The main road closure will be between Trout Creek and the intersections of Barton Lane (east) to Trephanny Lane (west). The contractor will provide access to all residents in the work zone areas, but there could some temporary delays as active excavation and construction activities go on during the daytime hours.  As noted, there will be no through traffic allowed during the active construction on Upper Weadley Road.

The Township would like to thank residents for their patience and understanding during this large and important Stormwater Management and Drainage Improvement Project. If residents have any questions please contact the Township Engineering Department at EngineeringDept@tredyffrin.org or you can speak with Hilliary Mallory, in the Engineering Department, at 610-408-3626.

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UPDATE: (August 1, 2025): The Township’s Willis/Arlyn/Upper Weadley Road Stormwater Management and Drainage Improvement Project is scheduled to begin construction activities on/or around August 18, 2025. This project will involve the removal, replacement and upgrade of underground stormwater drainage piping, inlets, manholes, as well as the installation of one (1) underground stormwater infiltration bed beneath the roadway on Arlyn Circle, and construction of one (1) aboveground stormwater basin in a Township owned parcel off Willis Lane.  In addition, there will be some underground sanitary sewer utility work on Willis Lane and Upper Weadley Road which will occur along with this project.

The Township has hired N. Abbonizio Contractors, LLC to do the construction activities, with work is expected through June of 2026.  During portions of the project, while specific work is being performed to replace sanitary sewer pipes or storm piping and inlets beneath Township roadways, there will be some daytime road closures to allow the contractor to remove and install the new infrastructure.  Residents will be allowed to access their properties within the project work zone areas, but may experience some temporary disruptions during the daytime while active excavation or installation of infrastructure is occurring, which will be coordinated by N. Abbonizio.  Through traffic on Upper Weadley Road will be limited during the daytime while work is being performed on Upper Weadley Road, but residents will still have access from either Old Eagle School Road (to east) or West Valley Road (to west).

The Township asks for residents patience and understanding as work is being performed for this critical Township Stormwater Improvement Project.  This project will greatly benefit the residents and property owners living along the Upper Weadley Branch of Trout Creek, by capturing, managing, infiltrating and/or reducing peak flow rates of existing stormwater runoff from existing historical development neighborhoods.

If residents have any questions please contact Hilliary Mallory at (610) 408-3626 or contact the Engineering Department at EngineeringDept@tredyffrin.org for any questions about this stormwater improvement project.

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UPDATE (October 10, 2024): On Tuesday, October 1, 2024, the Township Engineering Department, along with our stormwater consultant Princeton-Hydro, held a stormwater project update meeting with local residents.  During the meeting, there was a short 30-minute presentation, followed by a question and answer session. Click here(PDF, 4MB) to see the presentation made at the October 1, 2024 meeting. 

The Township Engineer and our consultants provided updates to the Preliminary Design for future stormwater drainage infrastructure and aboveground (SG) and underground (UG) stormwater management measures (Basins, Beds, Inlets and Piping, etc.) that will be installed to help address existing drainage problems in the Woodcrest/Willis/Upper Weadley areas of the Township. The future project site is located in the Upper Weadley Tributary, which feeds into Trout Creek, and the proposed project is being designed to help replace, improve and upgrade existing drainage infrastructure (inlets, piping, etc.), while also installing UG and AG stormwater Basins and Beds which will collect, store, infiltrate, and reduce stormwater runoff coming from the surrounding upstream drainage areas. Preliminary Design has been completed, and Final Design and Bid Documents are expected to be ready for bidding in early 2025. Construction activities will be phased and will begin in 2025 and be completed in 2026. The project is being funding from several funding sources, including a large $1.88 million grant obtained from the Commonwealth of PA earlier this year, as well as other Township ARPA and Stormwater Fund dollars. Residents having any questions can contact the Township Engineering Department at EngineeringDept@tredyffrin.org

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UPDATE (March 4, 2024): On February 8, 2024, the Township held its second public meeting for the Willis/Woodcrest/Upper Weadley Road Stormwater Improvement Project at the Tredyffrin Township Library. The meeting was well attended with residents in the project area. The Township and engineering consultants from Princeton Hydro provided a project update, a short presentation, and answered questions from local residents. Click here(PDF, 2MB) to see the presentation made at the February 8, 2024 meeting.

The Willis/Woodcrest/Upper Weadley Road Stormwater Improvement Project will be looking at removing and replacing existing aged/deteriorated underground Township stormwater drainage systems (inlets, manholes, piping, etc.) and even more importantly is the plan to install new and improved underground/aboveground stormwater storage systems to help reduce the severity of flooding in the immediate area, as well as for those resident living further down along the Upper Weadley Road tributary to Trout Creek. 

Township staff continue to work with Princeton Hydro, who will be developing their stormwater plans in 2024, and the Township will be looking to plan for a phased construction effort starting in 2025 and lasting into 2026 to complete all the planned improvements.

If residents have any questions they can contact the Township Engineering Department at 610-408-3626 or e-mail EngineeringDept@tredyffrin.org. Continue to check the Township website for updates as they become available.

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The Township Engineering Department is working on a project for flood reduction stormwater management facilities, such as Underground Infiltration Beds, and/or surface impoundment Basins/Rain Gardens, in Woodcrest Road, Willis Lane, Upper Weadley Road, and Harwick Road. This area is listed as a high-priority sub-watershed identified by the Stormwater Task Force, and the Township.

• Township staff submitted a FEMA BRIC Grant in December 2020 for this stormwater flood reduction project consideration
• Funding with FEMA BRIC would be 75% (Federal) and 25% (Township)
• The Township didn’t not receive funding in 2021 but was advised to resubmit the stormwater project in the next round for FEMA funding
• Township staff will resubmit for the 2021 FEMA BRIC Grant Round, and/or use American Recovery Funds for these improvements
• At the January 18, 2022 Board of Supervisors meeting, Princeton Hydro's proposal for Engineering Services in the amount of $221,400 was approved. Project survey, design & permitting is expected to be completed in 2022. The proposed engineering design services will be funded with use of ARP Funding, as identified in the approved 2022 capital budget and 2022-2026 capital budget plan.
• Construction – 2023 – 2024