In the early 20th century some residential development of the area began, at first as an extension of Gentilly. Construction of the Industrial Canal began in 1918 and was completed in 1923, creating the principal geographical barrier that would separate the East from the rest of New Orleans. Eastern New Orleans' present southern boundary was realized in 1944 with the completion of a re-routing of the Intracoastal Waterway, involving the excavation of a new segment stretching east from the Industrial Canal to the Rigolets, cut through the raw swampland south of the Gentilly Ridge and north of Bayou Bienvenue.