North Barstow St Pedestrian Underpass Location: Eau Galle, Wisconsin Contractor: Dunn County Highway Department Size: 10′ x 8′ box culvert w/ 64′ span Purpose: To provide a pedestrian underpass for a trail to pass through. About this Project Wieser Concrete produced a 10′ x 8′ box culvert for a pedestrian underpass in Eau Galle, Wisconsin that spanned 64′ in length.