Urban slope failures carry consequences that extend far beyond the hillside itself — threatening adjacent homes, disrupting traffic on critical corridors, and raising difficult questions about how to repair what was lost while protecting what remains. Along Frederick Avenue in Baltimore City, a slope at risk of landslide demanded not just engineering — but craftsmanship. The resulting project earned the Maryland Quality Initiative Modal Award for Projects Under $5 Million in 2022.
The slope along 5100 Frederick Avenue had reached a tipping point. Without intervention, further movement would threaten the roadway, adjacent structures, and the utilities running through the area. Working as a subcontractor to P. Flanigan & Sons, Inc., GeoStabilization conducted a thorough site assessment in January 2021 — evaluating slope geometry, equipment access, and the locations of overhead and underground utilities that would need to be carefully avoided throughout construction. The project required not only structural performance but also an aesthetically acceptable finished product given its prominent urban location.
GeoStabilization's scope of work centered on the installation of a soil nail shotcrete retaining wall ranging from 5 to 24 feet in height. The work included installation of 165 soil nails — referred to as permanent soil anchors in the project plans — anchored 12, 14, and 16 feet into natural ground, along with 5,370 square feet of shotcrete facing. GSI installed the initial 4-inch shotcrete layer, with the final 8-inch facing — including all decorative finishing — applied to achieve a sculpted and stained natural stone appearance. Coordination with utility providers was essential throughout construction to avoid conflicts with the dense infrastructure present along Frederick Avenue.
The completed project successfully eliminated the landslide risk along Frederick Avenue and delivered a finished wall that complemented the surrounding urban environment. The project team received the Maryland Quality Initiative Modal Award for Projects Under $5 Million, recognizing the quality, innovation, and collaborative execution that defined this effort. It stands as a demonstration of what is achievable when geotechnical expertise, aesthetic sensitivity, and strong partnership come together on a challenging urban project.
