Structural Engineering

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11th Street/Grove Terrace Retaining Wall

The IIW team revived the historic limestone retaining wall supporting Grove Terrace within the nationally recognized Historic District in the thriving community of Dubuque, Iowa. Among the wall’s signature features was a limestone arch that a town trolley traveled through in the early 1900s. While the retaining wall, originally constructed in 1887, needed significant restoration, […]

Highway 52/151 Shoring

IIW devised a plan to maintain the structural stability of an existing bridge in order to keep traffic moving along one of Dubuque’s major thoroughfares during the reconstruction of U.S. Highways 52, 151 and 61. Throughout the design process, IIW’s concept re-used and recycled components of the former bridge structure to minimize environmental impacts and […]