Which canal, the Conewago Canal or the Orleans Canal is longer ?
Conewago Canal:  Work on the canal of less than 1 mi began in 1793 and was completed in 1797. Orleans Canal: The Orleans Canal is a drainage canal in New Orleans, Louisiana. Orleans Canal:  The current version of the canal is about 2 km long, running along the up-river side of City Park, through the Lakeview and Lakeshore neighborhood, and into Lake Pontchartrain.
The Orleans Canal