Van Cleef was contracted by the County of Sussex to provide design services for the replacement of the North Church Road Viaduct over the Wallkill River and New York, Susquehanna & Western (NYS&W) Railroad. The main viaduct was a 456-foot long, steel girder superstructure with a non-composite concrete deck, with an intersecting 200-foot-long steel girder with non-composite concrete deck, ramp framed in at the east side of the Wallkill River servicing a local street. This structure had undergone several rehabilitation projects in its life span and presently had a load restriction for truck traffic.​

Work effort included: Structural design of the main viaduct replacement (North Church Street)as a 456-foot, five-span, multiple steel girder structure including a two-span continuous section, a three-span continuous curved section with an integral pier cap to provide minimum clearance over the railroad, a parallel 200-foot, two-span continuous multiple steel girder structure over the Wallkill River servicing Susquehanna Street, and five retaining walls; Roadway design including alignment for the relocated Susquehanna Street and improved roadway profiles; Geotechnical investigation and foundation design; traffic engineering for detailed detour plans and signing and striping plans; utility coordination and accommodation; topographic survey and right-of-way engineering; drainage system design and stormwater management plan including stormwater detention for water quality control; preparation and approval of NJDEP permit applications for Freshwater Wetlands General Permit, Flood Hazard Area Individual Permit with Riparian Replanting plan; Cultural resources including coordination with the NJ State Historic Preservation Office (NJHPO) related to design requirements of the North Church Street Viaduct and; extensive public outreach program to work with local residents and other stakeholders.