The Ohio and Erie Canal, the greatest engineering achievement in Ohio during the pre-railroad era, traversed nearly six miles of Warwick Township. Completed in 1830, it brought prosperity to the village of Trenton, now Tuscarawas, and to township farmers and merchants. Several warehouses were built at Trenton as shipping points for the area's agricultural and mineral products to new markets throughout Ohio and the region. Beyond transportation, the canal supplied water rights leased by the state to mills and factories, provided ice cut and stored in winter for year-round use by stores and taverns, and offered local residents recreation through fishing, boating, swimming, ice skating, and picnicking. The Upper Trenton Lock, Lock 15 South, was built between 1828 and 1829 of cut sandstone blocks and was named for the Village of Trenton. Lock 16, the Lower Trenton Lock, lay only 800 feet southwest, and the lock tender living on this site served both locks. After repeated flood damage, Lock 15 was rebuilt in 1907, with its deteriorated stone masonry completely replaced by concrete at a cost of $6,815, and the old stone was used to shore up the towpath. By then use of the state-owned canal had declined significantly, and the great flood of 1913 ended the canal era in Ohio.