Illinois 177 was closed Monday afternoon near New Memphis while hazmat crews waited on equipment to upright a 1,000-gallon anhydrous ammonia tank near New Memphis in Clinton County.
A pickup truck was pulling two of the so-called "nurse tanks" on the road when for unknown reasons one of the tanks tipped over into a ditch, St. Clair County Emergency Management Agency Director Randy Lay said. New Memphis is about six miles east of Mascoutah.
The tank was not leaking the poisonous gas and the road was expected to open to traffic around 5:30 p.m., Lay said.
Anhydrous ammonia is stored under high pressure within nurse tanks to allow farmers to use as a liquid when fertilizing crops.