On February 13, 1981, a series of explosions destroyed more than 13 miles (21 km) of sewer lines and streets in the center of Louisville in Kentucky, United States. The explosions resulted in extensive damage to property and infrastructure; there were no fatalities, but four people were injured.
The blasts were caused by the ignition of hexane vapors which had been illegally discharged from a soybean processing plant owned by Ralston-Purina and located on Floyd Street. The plant had been a processing facility for cottonseed or soybeans since at least 1900.
Repairs to the sewers and streets took about two years.