Garretts Mills Road Bridge

Brudis & Associates, Inc. (BAI) was responsible for the assessment, inspection, analysis, and design for the $1.1M design-build bridge replacement project in Washington County, Maryland. During the flood of May 2018, the 23’-0” x 13’ +/- concrete slab, integral steel beam bridge and adjacent roadway suffered severe damage, rendering significant portions of the roadway unusable. As part of the Building Systems Inc. design-build team, BAI developed the design for a replacement structure over Israel Creek. BAI was responsible for all design elements including structural, roadway, drainage, hydrology & hydraulic analysis, Storm Water Management (SWM), erosion and sediment control design, and necessary permissions in accordance with applicable State, County, AASHTO, and MDE specifications/standards. The existing one-lane structure was a concrete slab and integral steel beam bridge originally built in 1910 and reconstructed in 1989. The project lasted approximately 8 months from design to bridge opening to traffic.

BAI divided the project into 2 submittals to accelerate the contractor’s mobilization and start of construction. MDE and Washington County Soil Conservation District (SCD) considered BAI’s first package an emergency package. In this package, BAI established erosion and sediment controls to remove the damaged structure and debris, as well as to ascertain proper placement of the sub-footing concrete. BAI received approval from MDE and SCD in under 75 days. During this period, BAI developed the design for a single span concrete precast arch structure placed on precast footings, and finalized the roadway profile, signing and markings. BAI obtained final permits in under 105 days.

Structural Engineering:

Structural engineering design task included demolition details, establishing the proposed bridge type and span, determining the foundation requirements, setting the wingwall lengths, and determining the traffic barrier details. Based on the computed scour depths, the design-build team elected to cast sub-footing concrete directly on rock to provide scour protection to the new structure. To accelerate the construction schedule, BAI utilized precast footings, arches, and wing-walls. BAI provided on-site technical support and shop drawing review services during construction.

Water Resources and Environmental: 

Water resources and environment design tasks included drainage, stream hydrology and hydraulics, storm water management, erosion and sediment control, and coordination with permit review agencies (e.g., JPA package to MDE, ESC plans to Washington County Soil Conservation District) and the construction contractor.