Location: Kershaw County, SC

Client: SCDOT

Cost: $2.4 million

Project Manager: Jeff Mulliken, PhD, PE

Completion: Design: 2023 | Construction: Ongoing

Design Disciplines: Bridge Design/Structures, Roadway Structures, Construction Services, Hydrology/Hydraulics, Utility Coordination

S-349 Bridge Replacement over Sandy Branch

Project Description:

Carolina TEA was selected from the SCDOT Bridge On-Call to develop construction plans for the replacement of a closed bridge. The selection was based on the ability to deliver the design on an accelerated schedule. Carolina TEA provided Project Management, Bridge Design and Roadway Design Services. The project also included utility coordination, SUE, geotechnical exploration and design and hydraulic analysis.

The hydraulics and hydraulics analysis were complicated by a preexisting roadbed upstream from the bridge. A 2D hydraulic model was used to reduce stream flows and velocities to appropriately size the bridge.

Geotechnical design was complicated by liquefiable soils. A structural solution was implemented to avoid costly ground improvements at the bridge ends. Utility coordination was complicated by a waterline owner that did not want to move their lines and was confrontational. Persistence by the UC team facilitated an agreement and allowed the project to proceed on schedule.

The Carolina TEA led team delivered construction plans for the project four months after NTP. This project is currently under construction and the bridge is expected to reopen in April of 2025.

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S-55 over Twelve Mile Creek

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S-385 over Smith Branch