Temporary bridge replacement in the US

A temporary bridge structure provided by Acrow Bridge is maintaining traffic flow for a key crossing in Vermont. The bascule bridge is allowing both vehicular and vessel traffic to pass during the reconstruction work to the North Hero-Grand Isle Drawbridge in Vermont. The US$60 million project involves replacing the historic twin leaf bascule bridge on Lake Champlain. This modular steel bascule bridge is allowing transport to continue to and from the Lake Champlain island towns of North Hero and Grand Isl
July 2, 2019 Read time: 3 mins
The temporary, modular steel structure from Acrow Bridge is helping ensure vehicle and vessel traffic can be maintained while a new crossing is built at Lake Champlain
A temporary bridge structure provided by Acrow Bridge is maintaining traffic flow for a key crossing in Vermont. The bascule bridge is allowing both vehicular and vessel traffic to pass during the reconstruction work to the North Hero-Grand Isle Drawbridge in Vermont. The US$60 million project involves replacing the historic twin leaf bascule bridge on Lake Champlain.


This modular steel bascule bridge is allowing transport to continue to and from the Lake Champlain island towns of North Hero and Grand Isle, Vermont. The bridge replacement work was needed due to an increasing number of costly emergency repairs over the last several decades. There had also been difficulty in sourcing parts for repairs.

Built in 1953, the bridge is located on US Route 2, the only connecting passage through the islands and a critical link south to the Vermont mainland. It carries 3,000 cars and trucks/day during the off-season and double that number during the summer and fall months. Without a span in place during construction, a detour of around 100km would result. In addition, the drawbridge allows for sailboats and large motor vessels to pass through the channel between Grand Isle and North Hero and is required by the 7007 US Coast Guard to be opened on a regular schedule and during emergencies between May 15th and October 15th each year. As each missed opening would incur large fines, the Vermont Agency of Transportation (VTrans) deemed a provisional lift bridge critical to the success of the multi-year project.  

Contractors broke ground on the project in July 2018 and continued their work on Acrow’s bascule bridge throughout the winter ensuring a fully functional structure for the first required opening of the season on May 15th, 2019. When the new structure opened, the old bridge was raised for the last time and will be dismantled in the open position so vessel traffic will not be impacted.

The Acrow bridge is 9m wide to accommodate two lanes of traffic. The movable bascule span is 18m long and the back span is 21m long for an overall length of 40m. The back span also includes a pedestrian walkway to allow access to the control cabin. Acrow’s structure is currently scheduled to be in service until May 2021, when traffic will begin to use the new drawbridge. The project completion date is estimated to be 2022.

The project owner is VTrans, with Cianbro Corporation acting as CMGC (construction manager-general contractor) partner. Acrow designed the bascule span, the back span and the mechanical systems of the rental structure, with temporary approach spans design and project engineering by Cianbro. HDR engineering was engaged as a consultant to VTrans.  

“After a number of years of preliminary planning by VTrans, the design process was addressed in a deliberate and collaborative manner so that the bridge opening deadline was successfully met in order to commence the new navigation season,” said Randy Needham, New England regional manager at Acrow. “It has been a pleasure to be a part of this important project, and know that our solution is believed to have cut down on the overall project timeline by a year.”

Road Structures

For more information on companies in this article

Related Content

  • Realigning Kenyan bypass to avoid quagmire and ease congestion
    March 22, 2012
    Japanese consultants are planning to realign a Kenyan bypass, as Shem Oirere reports. Japanese consultants are resolving an engineering quagmire involving a 17.5km bypass in Kenya's Coast region. The new design realigning the bypass is underway by Japanese International Cooperation Agency (JICA) consultants. The road is an alternative link from the hinterland to the south coast and to the proposed Dongo Kundu Port. The 23m-wide bypass would also serve to reduce traffic congestion across the Likoni Channel.
    Read More
  • Realigning Kenyan bypass to avoid quagmire and ease congestion
    March 21, 2012
    Japanese consultants are planning to realign a Kenyan bypass, as Shem Oirere reports. Japanese consultants are resolving an engineering quagmire involving a 17.5km bypass in Kenya's Coast region. The new design realigning the bypass is underway by Japanese International Cooperation Agency (JICA) consultants. The road is an alternative link from the hinterland to the south coast and to the proposed Dongo Kundu Port. The 23m-wide bypass would also serve to reduce traffic congestion across the Likoni Channel t
    Read More
  • Preparations are underway for a new bridge in Venezuela
    June 25, 2013
    A large bridge project is being planned in Venezuela, with ground investigation leading the way In Venezuela, preparation work is now being carried out for a major new bridge project. The European geotechnical specialist Lankelma is supplying its Combifloat C5 jack-up platform, JUP Sandpiper, to begin work on the ground investigation for the new Puente Nigale (in English: Nigale Bridge) over Lake Maracaibo in Venezuela. The Nigale Bridge will be the second crossing over Venezuela’s largest lake. The link,
    Read More
  • New runway for US military airbase in Florida
    December 7, 2017
    A new runway surface has now been laid at MacDill Air Force Base in the US, located approximately 6.4km south-west of downtown Tampa, Florida. This facility is the base for the US Air Force’s Air Mobility Command, which provides airlift, special missions, aerial refuelling, and aeromedical evacuation for the armed forces. MacDill is home to 16 KC-135 Stratotankers and three C-37 Gulfstreams, which use the runway every day. At any point, there will be a steady flow of aircraft departing and landing on the
    Read More

Highlighted Content