The second longest of the Erie Canal aqueducts, the Seneca River Aqueduct was 840 feet, 5 1/2 inches long. Thirty piers and two abutments of Onondaga limestone supported a heavy timber trough which carried canal water over the river. Thirty-one stone arches supported the towpath. Construction began in January 1849, and the completed aqueduct was brought into use in Spring 1857. Located in the town of Montezuma in Cayuga County, N.Y., the aqueduct was designed by and built under the direction of Van R. Richmond, State Engineer and Surveyor, and thus is also known as the Richmond Aqueduct. When the Enlarged Erie Canal was replaced by the Barge Canal in 1917, part of the aqueduct was torn down to give boats clear run of the river. Today, seven arches remain on the east shore and three arches remain on the west shore.
For the elevation plan and historical pictures of the Seneca River Aqueduct, see Historical Images of the Seneca River Aqueduct on the Images of the Erie Canal between Rochester and Syracuse page.
Below are photographs of the remains of the Seneca River Aqueduct taken from the heelpath (south) side in early April 2010 -- click on an image below to see the full-size version.
Below are photographs of the remains of the Seneca River Aqueduct taken from the towpath (north) side in mid-August 2010.
http://www.eriecanal.org/SenecaRiverAqueduct.html