Structural Engineering

Bridges & CulvertsCommercialHealthcareHigher EducationIndustrialRetaining Structures

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, […]

Airport Road over Branch Platte River

IIW balanced an endangered species habitat and bridge size and placement when replacing a bridge that had been deemed functionally obsolete, narrow, and structurally deficient along Airport Road in Grant County, Wisconsin. To improve the geometrics of the roadway approached, IIW designed the replacement bridge on a relocated alignment over a Branch of the Platte […]

D-22 Over Dry Creek Box Culvert

Buchanan County called on IIW to evaluate a deficient, narrow bridge that faced growing traffic counts and was adjacent to an active railroad. IIW evaluated replacement options that provided solutions which did not impact adjacent railroad or encroach on the railroad right-of-way. IIW performed a hydraulic analysis to determine structure options, selecting a reinforced concrete […]

Flexsteel Corporate Headquarters

Flexsteel partnered with IIW to identify a site, develop a concept and fully design its new corporate headquarters to take advantage of the location’s Mississippi River view. The completed facility spans 46,000 square foot occupying four floors. The building provides a variety of flexible space, including open office areas, private offices, conference rooms, and a […]

Flexsteel Manufacturing Facility

Flexsteel Industries spent more than 80 years at its Jackson Street Manufacturing Facility in Dubuque, Iowa. Knowing the facility had outlived its life, company leaders announced they would close the facility and build a new $25 million, 250,000-square-foot-facility in the Dubuque Industrial Center South. Not only would they be gaining a modern, more efficient facility, […]

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 […]

Industrial / Manufacturing: Bridge Crane and Conveyor Support Systems

Hanging a crane or conveyor system from an existing structure requires structural analysis to ensure the existing structure can safely support loads generated by the crane or conveyor system. IIW’s structural engineers have extensive experience with evaluating existing structures and designing reinforcing for the structures when deemed necessary. We work with our clients to understand their crane […]

Industrial / Manufacturing: Building Modifications

Industrial and manufacturing buildings often require modifications to meet the demands of the ever-changing operations within those buildings. IIW’s structural engineers assist with a variety of building modification projects to meet our clients’ goals. Thoughtfully prepared and thorough construction documents minimize surprises during construction, making it easier to maintain project schedules and budgets. Building Modifications Truck Dock […]

Industrial / Manufacturing: Damage Inspection, Assessment, and Repairs

Sometimes the unexpected happens in industrial and manufacturing buildings–whether it be discovering questionable cracks in a reinforced concrete structure, or finding a steel building column was accidently damaged in a fork truck collision. IIW’s structural engineers take pride in providing responsive site observation to assess the severity of damage and deficiencies, quickly formulating repair solutions to keep […]

Industrial / Manufacturing: Equipment/Machine Foundations

Machines, storage tanks, and other equipment are an integral part of industrial and manufacturing buildings. In most cases, it is vital that the equipment be securely anchored to a solid foundation with the capacity to resist lateral and uplift loads generated by the equipment, or by wind against the equipment for outdoor installations. IIW’s structural engineers work […]

Lower Bee Branch Creek Restoration

Located in the north-central portion of Dubuque, the Bee Branch drainage basin has a long history of extreme flooding. The Bee Branch Restoration Project aims to change that. In the initial phase, IIW designed two continuous concrete slab bridges that met the community’s goals for flood prevention and aesthetic appeal. Early in the project, leaders […]

Mercy Medical Center – 1947 Building Restoration

Mercy Medical Center looked to the IIW team when it desired to relocate its psychiatric services ward and revive two of its old buildings. Founded in 1893 by Sisters of Mercy, it is the longest continually operating hospital in Dubuque, Iowa. The project began with the renovation of the 1947 building. This extensive remodel included […]

MercyOne Cancer Center

MercyOne identified a need in the Dubuque community for a comprehensive cancer center, where patients could receive all treatments at one location. Company leaders worked with IIW to design a center where patients could receive outstanding clinical care, emotional support and guidance in a comfortable environment. The cancer center was an addition to the east […]

National Mississippi River Museum & Aquarium

IIW served on the design dream team to create the National Mississippi River Museum and Aquarium. The complex facility, led by Esherick Homsey Dodge and Davis of San Francisco, California, included the design of a variety of intricate exhibits and five integral concrete aquaria totaling 30,000 gallons. IIW helped provide the design expertise on major […]

North Cascade Road over the South Fork Catfish Creek

IIW led the emergency replacement of the North Cascade bridge after it was washed out by a summer storm in Dubuque, Iowa. IIW’s engineering team conducted a hydrologic and hydraulic analysis to determine the optimal type, size and location of the bridge over South Fork Catfish Creek. The mapped floodplain and detailed flood study led […]

Portzen Construction Office Addition

Company growth and a lack of space prompted Portzen Construction to move forward with an addition to their existing corporate office building. Portzen’s existing building is a precast concrete wall panel building. The building owners wanted to re-use the existing wall panels that were being removed, and incorporate them into the layout of the addition. […]

UW-Platteville Rountree Commons

Set into a hillside overlooking the Rountree Branch of the Platte River, Rountree Commons at the University of Wisconsin-Platteville gives students a picturesque community to live and learn in. Design of this unique six-story residential hall started in Spring of 2011 and opened for 620 students in the Fall of 2012 under the direction and […]

Upper Bee Branch Creek Restoration

The City of Dubuque’s Bee Branch Creek Restoration Project was the largest capital improvement project in the City’s history, serving as both a watershed solution and a catalyst for neighborhood reinvestment and revitalization. The design takes former industrial, commercial, and residential properties and creates an open waterway with a linear park—complemented by highly-visible bridge, culvert, […]

Verena Street Coffee Co.

Verena Street Coffee Co. produces craft roasted coffee that is distributed both locally and nationally. As their business experienced a boom in growth in a short five year period, the owners knew it was time to expand. In late 2015, they broke ground on a new 35,000 sf coffee roasting facility in the Dubuque Industrial […]

Water Street over Wapsipinicon River

IIW’s work on the Water Street bridge over the Wapsipinicon River in Quasqueton, Iowa, began with the evaluation of a series of rehabilitation options. IIW helped city and county officials understand the costs of structure repair compared to a new structure. Upon the review of the widening options, the City and County chose to replace […]