Post Content

Shoukry Headshot Mar2010
Posted by Shoukry Elnahal, Deputy Chief Engineer for Bridges and Tunnels

Route 9 and Cedar Street were quietly reopened to traffic on Monday morning, almost twelve hours before they were scheduled to be open. A few onlookers watched as some of the first cars travelled under Route 9, and a few drivers sounded their horns and waved appreciatively at the workers. Onlookers stopped by the site throughout the weekend to watch the work rapidly progress. Over a hundred people stood by as the bridge moved—ahead of schedule— down Route 9.

The secret to the incredibly fast bridge replacement was the strategy used by MassDOT and its engineers and builders, which was aimed firmly on a single goal: to provide the best possible customer service to road users and the community by building a long-lasting bridge, safely, efficiently, economically, and with the least possible impact to traffic and the community. To accomplish that, MassDOT pre-constructed the replacement bridge superstructure in a cloverleaf near the old bridge. Doing so kept a vast majority of the work outside of the roadway, nearly eliminating traffic impacts to Route 9.

As shown in the short movie below, once the new bridge superstructure was ready, MassDOT needed to demolish the old bridge and install new portions of the center pier and abutments. On Sunday morning, all preparations were complete. At 5:00 AM, four multi-axle machines called Self-Propelled Modular Transporters (or SPMTs) rumbled to life from their position underneath the new bridge superstructure. They moved in unison, carrying the 530-ton bridge from the cloverleaf onto the Cedar Street ramp. Then, at 8:15, the SPMTs’ many wheels rotated 90 degrees, and the bridge moved smoothly down the ramp onto Route 9 as the crowd watched, amazed. The wheels rotated again, and the bridge moved down Route 9, arriving at the pier and abutments at 9:30. The SPMTs held the bridge above the substructure until the early afternoon, when it was lowered into place.

Crews worked throughout the night to prepare to reopen the bridge. Temporary lane markings are in place and one sidewalk is open for pedestrians. Crews will continue to put the finishing touches on the bridge throughout the month, during off-peak hours. This work includes installing architectural pilasters, final paving and lane marking, completion of sidewalks, and installing signs.


Written By:

Recent Posts

Danvers: Route 128/Route 62 Interchange Crash Reduction posted on Oct 21

Danvers: Route 128/Route 62 Interchange Crash Reduction

MassDOT has announced that due to several recent improvements, there has been a sharp reduction in the number of traffic crashes at the interchange of Route 128 with Route 62 in Danvers. MassDOT worked collaboratively for several months with elected and local officials, the Danvers   …Continue Reading Danvers: Route 128/Route 62 Interchange Crash Reduction

MBTA Forest Hills Bus Canopy Public Meeting Set posted on Oct 21

MBTA Forest Hills Bus Canopy Public Meeting Set

The Casey Arborway Project includes expansion of the Upper Busway at the MBTA’s lntermodal Forest Hills Station. A Public Meeting on the Forest Hills Bus Canopy Project has been scheduled as follows: Wednesday, November 2, 6:30 to 8:30 PM, The English High School, 144 McBride   …Continue Reading MBTA Forest Hills Bus Canopy Public Meeting Set

All Electronic Tolling Information, Public Meeting posted on Oct 19

All Electronic Tolling Information, Public Meeting

The new All Electronic Tolling program on I-90 and the Boston tunnels will “go live” on Friday night, October 28th. A final Toll Plaza Demolition Public Meeting is set for tonight: • Wednesday, October 19th – Brighton WGBH – Yawkey Theater, One Guest Street Plaza   …Continue Reading All Electronic Tolling Information, Public Meeting