Dimensions - March/April 2008 - 4

Emergency Repairs Reopen Dam Ahead of Schedule Restoration Brings Rainbow Lake Back to Community Following a devastating nor’easter in April 2007, residents and business owners in the township of Pittsgrove in Salem County, New Jersey, found their 91-acre community lake reduced to a vast muddy field. The Rainbow Lake Dam, which carried State Route 56 over the dam spillway and was vital to the local economy, had been breached, resulting in an 80foot-long collapse of the entire roadway embankment. The collapse depleted the lake—part of a state Wildlife Management Area and a popular recreation spot—and forced residents and daily commuters to find other east-west travel routes. The damage presented a difficult challenge to community businesses in particular. The New Jersey Department of Transportation (NJDOT) quickly responded to the situation, working closely with residents and business owners to create temporary detours that would minimize the impact on local commerce while simultaneously launching plans for a fast-track schedule of demolition, design, and construction for the dam’s repair. Having tasked Dewberry with a number of emergency bridge repair projects in the past, NJDOT again called on the firm to engineer the new bridge and roadway, and to assist with environmental permitting and utility relocation planning. Dewberry also helped to establish the emergency detour In May, the American Society of Civil Engineers, New Jersey, will recognize this project as the Outstanding Civil Engineering Project of the Year because of the engineering team’s resolve to find answers to infrastructure challenges. bridge create a more stable lake elevation that will ensure that Rainbow Lake will not overtop the dam and roadway, which had occurred frequently in the past, for storms of 100-year frequency or less. route, requiring new signage and the installation of temporary signalization at three intersections. Construction documents for the bridge were issued within a month’s time, and construction was completed four months later, six weeks ahead of schedule. The project enabled NJDOT to upgrade the structure from a singlespan bridge with six sluice gates to a two-span, 110-foot-long bridge with a 200-foot-long semi-circular spillway. The longer spillway and “The Dewberry team truly met the challenge thrust upon them by NJDOT—delivering contract documents for advertisement in less than four weeks,” says Mike Kasbekar, PE, of NJDOT. “Even though the design was completed on an extremely accelerated basis, the number of issues arising during construction was minimal. Dewberry worked closely with us in an emergency situation to help restore the quality of life for the town’s residents.” 4
http://www.dullesgreenway.com/ http://www.springfieldinterchange.com/ http://sections.asce.org/newjersey/ http://www.nj.gov/transportation/

Dimensions - March/April 2008

Table of Contents for the Digital Edition of Dimensions - March/April 2008

Dimensions - March/April 2008
Contents
Digital Surveying: New Technology Helps Ascertain Risk
Fast-Track Engineering: Emergency Repairs Restore Rainbow Lake Dam
Awarding Excellence: Community-Minded Projects Dominate Awards Program
Student Panel Participates in Dewberry Annual Meeting
Project Lead the Way® Helps Future Engineers Find a Path
The Carbon Trading-Green Building Connection: Event Helps Define the Carbon Marketplace
Dimensions - March/April 2008 - Contents
Dimensions - March/April 2008 - Digital Surveying: New Technology Helps Ascertain Risk
Dimensions - March/April 2008 - 3
Dimensions - March/April 2008 - Fast-Track Engineering: Emergency Repairs Restore Rainbow Lake Dam
Dimensions - March/April 2008 - Awarding Excellence: Community-Minded Projects Dominate Awards Program
Dimensions - March/April 2008 - Student Panel Participates in Dewberry Annual Meeting
Dimensions - March/April 2008 - Project Lead the Way® Helps Future Engineers Find a Path
Dimensions - March/April 2008 - The Carbon Trading-Green Building Connection: Event Helps Define the Carbon Marketplace
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