Cianbro

Scope Of Work

Cianbro is rehabilitating the Merrimack River Bridge located in Haverhill, Massachusetts. This bridge plays a vital role in the Massachusetts Bay Transportation Authority’s (MBTA) operation, Amtrak Downeaster, and PanAm’s freight operation. The scope of work entails the Design Build rehabilitation of the bridge’s substructure, and the provision of scour countermeasures for the in-water elements.

Project Details

Cianbro is:

Repointing stone joints and repair nose using a masonry trade partner with historic stone structure experience

Installing and reinforce concrete micro-pile shafts for the construction of secant walls at the North and South Abutments

Installing steel sheet piles for scour countermeasure walls, around the granite block river piers

Conducting permeation grouting beneath Piers 1 thru 4

Installing grouted rip rap armament between scour walls and the existing substructure

Lean, Innovative, and Unique Project Solutions

Cianbro will coordinate with the Phase 1 Contractor performing superstructure repairs, which will require a mandatory shutdown due to the type of work entailed. During construction, trains will be crossing the bridge numerous times a day. Additionally, Cianbro will only be performing work during the allowable periods so that impacts to the protected fish species will be eliminated. In addition to time-of-year restrictions and winter shutdowns, turbidity curtains will be installed as an added measure of protection.