Hollingsworth Road Bridge Replacement

EBA provided structural, transportation, environmental, and geotechnical engineering services for the replacement of Hollingsworth Road bridge over an unnamed stream in Carroll County. The existing single-span steel beam bridge, constructed 48 years ago and approximately 19 feet long, had a clear roadway width of roughly 14 feet, 6 inches, thus providing only a single travel lane for two-way traffic. In addition, the overall poor condition of the deteriorated bridge required complete replacement.

After performing topographic and floodplain surveys, EBA developed and analyzed bridge replacement alternatives and then developed designs for the selected option, a reinforced concrete box culvert structure. These efforts involved load rating analysis, design calculations, cost estimating, and consideration of unique project challenges, including stream flow management and overhead utility lines that prevented crane use for the placement of bridge beams.

Geotechnical investigation and engineering services included performing two test borings to depths of more than 40 feet to determine subsurface conditions and soil characteristics. Using the results of soil tests conducted in EBA’s laboratory, we developed recommendations for design and construction.

Drainage, stormwater management, and erosion and sediment control design work involved performing a hydrologic and hydraulic study, along with using GISHydro2000 to create models and calculate flows. EBA also performed scour analysis, prepared permit applications, and developed contract documents for advertisement and construction. We then provided bid phase assistance, followed by review of shop drawings and inspection services during construction.

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