Bayou Corne/Grand Bayou Sinkhole | Assumption Parish, Louisiana


On May 31, 2012, parish officials were notified of areas of bubbling spots in the Bayou Corne and Grand Bayou waterways. Early on, it was determined that the bubbling was caused by a release of natural gas and not “swamp gas”. Monitoring for carbon monoxide, H2Sm and Lower Explosive Levels (LEL) at the bubbling spots began on June 22, 2012. During this monitoring, no dangerous levels were detected. Residents within the community experienced and reported tremors and the parish requested the assistance of USGS in determining the locations and probable cause(s) for this seismic activity. USGS immediately detected seismic activity through their monitors and began recording this data; however, no probable cause was able to be detected.

Early in the morning on Friday, August 3, 2012, Assumption Parish Office of Homeland Security & Emergency Preparedness Director John Boudreaux was notified by local industry that a sinkhole had formed overnight in the swamp in the area. The hole was discovered after a strong diesel smell was experienced in the proximity of the sinkhole. On that same day, parish officials called for a mandatory evacuation of residents in the community and parish officials requested the assistance of state agencies in the activities involved in this emergency.

This site has been created in an effort to provide information relative to this incident. If you have any questions regarding this site and the accessible data compiled, please contact Erin Watson at 985-772-1745 or


A blog has been created to provide residents with a central location to retrieve the most current information regarding Assumption Parish. Currently, the blog will be dedicated to disseminating information to residents in the Grand Bayou and Bayou Corne areas relative to the bubbling in the bayous and the slurry that formed on last Friday. To access the blog, visit If you have any questions regarding the blog or would like to make a recomendation, please contact Erin Watson at 985-772-1745 or via email,

Information compiled and provided by the Assumption OHSEP and responding agencies:

Seismic Monitor MapBubbling Locations MapSinkhole Map (distance from community)EPA Flight Summary

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