DDOT – Frederick Douglass Bridge Replacement/South Capitol Street Realignment
The project involves constructing a grade-separated interchange where U.S. Route 15/17/29 intersects Business U.S. Route 15/17/29 to the west and Lord Fairfax Drive (Route 808) to the east. The limits of the project are from approximately 0.7 miles south of US 15/17/29 Business to approximately 0.8 miles north of the intersection, for a total length of approximately 1.5 miles. The proposed interchange will remove the existing traffic signal on the Eastern Bypass, allowing free flow of through traffic. One bridge with two (2) spans supported by two fully integral abutments is proposed to support Lord Fairfax Road over Route 15/17/29 Business over US 15/17/29. Abutment walls and wing walls will consist of Mechanically Stabilized Earth (MSE) with maximum height of about 34.74 ft. Construction began in late 2018 and the interchange will be complete in early winter 2020.
DMY provided geotechnical exploration (field and laboratory), bridge foundation evaluation and design (shallow foundation, driven HP pile, drilled shaft), roadway embankment slope stability analyses, cut slope evaluation, pavement design, and prepared two geotechnical reports. DMY also provides geotechnical review and support during the construction (pile driving, abutment subgrade preparation, paving, etc.)
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