 His work at St. Paul's led to his final large commission for the Egyptian Revival hall for the Medical College of Richmond.By the mid-1850s, Stewart was listed in city directories as an architect and civil engineer.Stewart was employed by the County of Philadelphia to design a bridge over the Schuyllkill River at Chestnut Street, resulting in the publication of two volumes, "Report on the designs for a malleable iron viaduct across the Schuylkill at Chestnut Street (1854)" and "Report on the tubular arch viaduct to be constructed of malleable iron, across the Schuylkill at Chestnut Street (1855)."