Post-installing shear connectors can significantly increase the load rating for an existing non-composite bridge girder. For the bridge considered in this study, the load rating was increased by 65 percent. Construction operations required to install the shear connectors proved to be difficult, so modifications in the installation procedures may be warranted in future projects. Nonetheless, the results of this project demonstrated that post-installing shear connectors can significantly increase the load rating of an existing bridge, and this technique should be considered as an option for strengthening existing bridges.