New Hampshire wants to rehabilitate Rt. Bridge 12A: CEG

NH Rt. 12 A bridge over the Sugar River is expected to begin rehabilitation in 2023.


NH Rt. 12 A bridge over the Sugar River is expected to begin rehabilitation in 2023.
To keep the bridge open during construction, it must be converted to a one-lane and two-lane bridge during active construction, with traffic lights installed at each end of the span to control north and southbound traffic.

Claremont, NH, residents recently identified the impact of traffic and safety as top concerns over the state’s plan to rehabilitate the NH Rt. 12 Bridge over the Sugar River, construction of which is expected to begin in 2023.

Officials with the New Hampshire Department of Transportation (NHDOT) met with residents on Nov. 16 to discuss the state’s upcoming overhaul on Jarvis Hill Road, a section of NH 12A.

The $ 3.3 million project, targeted in New Hampshire’s current 10-year plan for the maintenance of transportation infrastructure, aims to remove the bridge from the state’s “red list”, a range of bridges that require interim inspections due to their poor condition.

Originally built in 1967, the two-track steel structure is 276 feet long and was last rehabilitated in 1991. Its beams are “badly rusted in places” and the concrete under the bridge deck is collapses, according to NHDOT project engineer Anthony Weatherbee.

He told the Eagle Times that the proposed work would replace the bridge, beams and other steel components as well as countermeasures to protect the piers from the elements during flooding or other flood events.

The Claremont newspaper reported that the biggest challenges anticipated during construction could be controlling and minimizing the impact on traffic.

For logistical reasons, Claremont officials, including city council and a traffic advisory committee, want to keep the bridge open during rehabilitation, according to Weatherbee. To achieve this, the bridge must be converted to a one-lane and two-lane bridge during active construction, with traffic lights installed at each end of the span to control the flow of traffic in the north and south direction. Teams will work on one side of the bridge while cars and trucks will travel on the other.

But NHDOT acknowledged that the physical location of the bridge also poses notable security challenges.

Its north end is within 100 feet of the busy intersection of Route 12 and Route 12A, which brings a constant flow of traffic to and from Vermont, as well as vehicles from the Upper Connecticut River Valley and of the manufacturing district of Claremont.

Public lighting in and around the bridge is also non-existent, according to the Eagle Times.

“Whenever we have this type of temporary traffic control setup, my biggest concern is frankly the middle of the night when everything is quiet,” said Teresa Sandell, project consultant for Missouri-based TranSystems Corp. “So we want to make sure we’re as obvious as possible [in our signage and lane designs] in which direction is assigned at that time. “

Traffic congestion is a concern during rehabilitation

NHDOT engineers also want to avoid dangerous safeguards around the intersection. While traffic on bridges is often lighter compared to traffic on the nearby NH 12, both roads are busier in the morning and evening, as are commercial trucks and farm vehicles.

Without proper traffic changes, the short distance between the north end of the bridge and the intersection could potentially create a backup in the intersection from vehicles waiting to cross the bridge.

“Thus, the traffic light at the NH 12 intersection must be coordinated with the [temporary] traffic lights on the bridge, “Weatherbee said at the November town hall meeting.” They’re all going to work together to try and alleviate some of the traffic problems. “

In addition, the project team plans to create two dedicated turn lanes on the NH 12, one for left turns and one for right turns, “so that vehicles wishing to make this turn on the bridge will not delay. not traffic or traffic … coming from the other direction, “Weatherbee noted.

Sandell said that while analysis has shown that some traffic backups occur during peak hours at the intersection, those backups typically last less than a minute.

“Much of the management will come down to adjusting the hours of the traffic lights,” she added. “We don’t expect to see any major delays or backups.”

The national transport agency said it was still working on the dimensions it could accommodate so that larger vehicles could cross the river, such as farm equipment, while the bridge was being rehabilitated.

Claremont, NHDOT must agree on lane closures

City leaders, during their meeting with project engineers, preferred to keep the bridge open to two-way traffic to alternatives provided by the state, the Claremont news source reported.

Other options included completely closing the bridge – which would have reduced the duration of the project to a single construction season – or limiting the use of the river bridge to one direction of traffic, Weatherbee said. But both alternatives would have required a diversion of traffic, including commercial trucks and large vehicles through central Claremont, which the city is currently working to limit.

Preferable detours were rejected due to clearance issues or laws that require New Hampshire to only create detours on state-owned highways.

The rehabilitation of the bridge is expected to begin construction in 2023 and last for two construction seasons. Weatherbee said unforeseen delays, such as material shortages or contractors’ planning, could delay the start of construction until 2024.

To keep the bridge open during construction, it must be converted to a one-lane and two-lane bridge during active construction, with traffic lights installed at each end of the span to control north and southbound traffic.

Source link

About Rhonda Lee

Check Also

Carter Post Vets: We Were Neglected at Mattapan Sq. Rehab

It’s hard to miss Sgt. William E. Carter American Legion Post 16 on Blue Hill …