Here's a page with the original sheet music

It goes on to say: "Like most folk songs, the lyrics (and title!) of The Erie Canal Song has changed over time. The most obvious changes from Thomas Allen's orignal version has been changing the word years to miles. Allen's original version commerates 15 years of working along the canal with Sal. The new version using the word miles refers to the average distance a mule would tow a barge before resting or being relieved by another mule."