Alexander Street Bridge Replacement Project

Roadway will be closed from November 6, 2019 - May 2020
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Update May 8, 2020:

Alexander Road opening on May 15, 2020 per NJDOT press release

Alexander Road is scheduled to re-open by May 15, 2020 per NJ DOT press release

Weather permitting, two bridges and one stream culvert on Alexander Street will be replaced during a 135-day roadway closure beginning on November 6, 2019.  The New Jersey Department of Transportation (NJDOT), owner of the D&R Canal Bridge on Alexander Road in West Windsor, has contracted with Anselmi & DeCicco, Inc., to replace their bridge structure.  Mercer County Department of Transportation and Infrastructure (MCDOTI) has contracted with Marbro, Inc. to replace the truss bridge over Stony Brook and a stream culvert located south of Lawrence Drive in Princeton.   

Here is a breakdown of the bridge replacement and closure:

What is happening?

A section of Alexander Street, between Lawrence Drive and Canal Pointe Boulevard, will close for about six months beginning on Wednesday, November 6, 2019, as the New Jersey Department of Transportation (NJDOT) and Mercer County Department of Transportation and Infrastructure (MCDOTI) replace aging bridges and a culvert that span the Delaware and Raritan Canal, Stony Brook and a tributary to Stony Brook.

Metro North restaurant and all businesses along Alexander will remain accessible during the road closure.  Residents of Lawrence Apartments, Basin Street, and Karin Court, and patrons of the Springdale Golf Club will access those locations via Lawrence Drive from Alexander Street.


The bridges,which are over 70 years old, are in poor condition and too narrow for today’s traffic. Their replacements will be safer, wider, improve traffic flow and include shoulders and sidewalks on both sides.

Who is involved?

NJDOT and Mercer County are working cooperatively to simultaneously replace bridges under each of their jurisdictions. While the Municipality isn’t responsible for construction, we are working with state and county officials, as well as Princeton University and other members of the community to help minimize traffic-related impacts. NJDOT, owner of the D&R Canal Bridge on Alexander Road in West Windsor, has contracted with Anselmi & DeCicco, Inc., to replace their bridge structure. MCDOTI has contracted with Marbro, Inc. to replace the truss bridge over Stony Brook and a stream culvert located south of Lawrence Drive in Princeton. To minimize the duration of traffic impacts, NJDOT and Mercer County have coordinated their project schedules.  


NJDOT's Officeof Community Relations can answer questions about the project:

What is the vehicle detour route?

The official detour route will follow Faculty Road to Washington Road to Route 1

Alexander St bridge closure detour route
Biking and Walking:

The D&R towpath will remain open, but there will be no access from Alexander. Those traveling to West Windsor by bike or foot can consider the following detour route: From Washington, take the D&R towpath south for approximately two miles to a pedestrian bridge. This bridge connects to Wheeler Way and then Canal Pointe Boulevard in West Windsor. The towpath is closed after sunset and is not plowed in winter. 

Traffic Tips:
  • Plan extra travel time.
  • Consider using a mobile navigation app such as Waze or Google Maps to identify the best route.
  • Try the Dinky! If you usually drive, now is a good time to try transit to avoid traffic congestion. It's a quick five minutes between Princeton and Princeton Junction. Because of the road closure, the Dinky may be busier than usual, so give yourself extra time.The Dinky runs from early morning to late night, and is timed to connect with Northeast Corridor trains. More info.
  • Consider the Dinky + Tiger Transit to get to offices along Route 1. Drive time between Princeton and offices along Route 1 may take up to 40 minutes. Taking the Dinky in conjunction with a Tiger Transit bus (the 693 Alexander or Overlook/701 routes) may be faster. The Tiger Transit bus system run by Princeton University is free for all to ride. No ID is required.
  • Sign up for Nixle alerts. Nixle is an emergency notification system used by the Princeton Police Department to send public safety alerts. It will likely be the first way to learn about road closures in and around Princeton. To opt-in for the alerts text 08540 to 888777. More info
  • Check the live traffic cams at
  • Wait out the evening rush by shopping and dining in town. Free parking after 6 p.m.Monday-Friday Nov 6-Dec 31. Downtown Princeton, and businesses on Alexander Street, are open for business during this closure. Downtown parking map
  • If you are an employer, consider implementing telecommuting and flex hours if possible. The Greater Mercer County Transportation Management Association (GMTMA), a non-profit organization, is available to assist with alternative travel options during the Alexander Road closure. They can provide insight and/or assistance with ride sharing, telecommuting, and flex hours. More info available at or by contacting Cheryl Kastrenakes, Executive Director, at (609) 452-1491 x 225 or

Additional Resources

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Relevant Documents

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2018 Annual Police Report22

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