Transportation

US 21 Bridge Replacement over Albergotti Creek

Client
South Carolina Department of Transportation (SCDOT)
Date
2016
Disciplines
Environmental
Site Planning
Transportation Engineering
Water & Wastewater Engineering
Objectives

Because the existing bridge was classified as functionally obsolete and structurally deficient, it needed to be replaced.

Scope

Replaced the existing 94’ x 64’ bridge with a new 120’ x 83’ bridge

Planned the roadway design to allow for enough space to install a temporary concrete barrier wall between the work zones and traffic

Phased construction to accommodate traffic and minimize environmental impacts

Assisted with permitting - although the project was eligible for a Categorical Exclusion from the NEPA process, it required both an OCRM Critical Area Permit and usage of SCDOT General Permit with the US Army Corps of Engineers for wetland impacts

Challenges

Because US 21 is a hurricane evacuation route, four lanes of traffic had to remain open at all times during construction

Outcome

Designed a larger, safer bridge with a longer approach and improved drainage.

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