Quinlan Bridge, also called the Sower bridge, was built circa 1850 as an 88-foot-long Kingpost Burr Arch bridge by an unknown builder. It stands downstream on Lewis Creek from the Seguin covered bridge and spans what was then the 1812 turnpike, part of which is now Spear Street. The surrounding land was owned by the Sherman family, who built a sawmill just up the creek in 1830. Although that building burned down, the area around the bridge remained a manufacturing center with a woodworking mill that made sash doors and blinds, a nail-making shop, and a foundry that cast plow points, cultivator teeth, and other farm implements. In the 1860s, Winfield J. Scott, a carpenter-joiner, operated a gristmill and butter tub manufactory nearby. Later, John Quinlan, an immigrant from Ireland, ran the mill. Portions of the old mill dam can still be seen from Lewis Creek Road above the bridge, and in recent times steel I-beams were inserted under the bridge to reinforce it for school buses.