Clients continue to investigate and advance their respective bridge delivery programs through the implementation of new designs that require innovative construction methodologies. The latter can be challenging for contractors when there is very limited know-how in the industry. The objective of this case study of a composite deck bridge (steel girders and concrete deck) with 34 m span, was to analyze the substructure and superstructure staged construction connection details, the grout and longitudinal joint trials conducted as well as the impact of differential deflections across the staged construction connection joint along the bridge deck. A thoroughly monitoring of each girder deflection, at every stage of construction, was conducted and the data analyzed against the design estimated defections. High early strength, rapid setting, flowable cementitious precision grouts were used in the trials, as well as some different types of construction joints to ensure adequate transmission of shear forces. Understanding that differential deflection across a staged construction field-casted connection can have a major impact on its long-term performance, the trials and survey monitoring conducted during construction processes have shown to be of high value for the outcome of the works delivered. Such deflections are the result of the bridge structural configuration, the loads distribution on the deck, and the locations of the applied loads. The teamwork between client, designers and contractors ensured the delivery of a high quality, resilient structure. Such solution can be implemented with more confidence in future projects where site and project specific constraints lead to adopt such construction methodology.