Will County Sheriff's police said a 12-inch pipeline going into the Citgo Refinery had been leaking, but is now stopped.
A HazMat team was on the scene taking air quality readings, but it was not known how much oil had spilled or how long the rupture was open.
"The oil spilled 300 feet from it's origin into a wetland area," police said, "but there does not appear to be any danger to the (nearby) I&M (Illinois and Michigan) Canal."
New Avenue north and southbound lanes have been shutdown due to a crude oil spill. New Avenue is closed from Archer Avenue in Lockport to 135th Street in Romeoville.
Service on Metra's Heritage Corridor between Joliet and Union Station in Chicago has been suspended because of the spill, according to Metra.
The leak happened near tracks used by Amtrak trains and is also resulting in delays and cancellations to Amtrak service, a release from Amtrak said.
Early service on the Lincoln Service, which travels from St. Louis to Chicago, have been delayed.
Travelers should contact Metra and Amtrak for updates on service: