A persistent frontal boundary interacting with a very moist airmass led to periods of showers and thunderstorms across central Illinois on June 19th and 20th.  The additional rainfall aggravated ongoing flooding concerns across west central and southeast parts of Illinois, which also led to a levee breach on Mauvaise Terre Creek in Scott County.

Flood in MORGAN, ILLINOIS
From 18-JUN-11 21:33:00 to 20-JUN-11 16:47:00 (CST-6)
Location: MEREDOSIA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The impacts of the flash flooding from the late evening of June 17th into the early morning of June 18th continued for nearly two more days. In addition, another 1.00 to 2.00 of rain fell over the flooded area from June 18th into the 19th. Many streets in Jacksonville, and the rural roads and state highways in much of the county were flooded for almost three days. The water finally receded on most roadways by late afternoon on June 20th. The damage at the Jacksonville Water Treatment facility resulted in a boil order due to contaminated water, which lasted for nearly three additional weeks for almost 25,000 people. Many businesses, including the Nestle Chocolate factory and Pactiv Manufacturing, remained closed until June 25th due to water damage and the lack of potable water. See the Flash Flood entry for June 17th-18th for estimated damages due to this historic flooding.

Flood in SCOTT, ILLINOIS
From 19-JUN-11 18:30:00 to 21-JUN-11 08:30:00 (CST-6)
Location: OXVILLE
Flood cause: Dam / Levee Break
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Areal flooding continued into the early morning of June 21st due to three levees which broke on the Mauvaise Terre Creek near Oxville early in the morning on June 19th. State Route 100 north of I-72 was impassable, nearly 2,000 acres of crops were covered with water, and west bound roads in and out of Oxville were inundated. The flooding subsided on the roadways shortly after daybreak on June 21st.
See the corresponding Flash Flood entry on June 19th for details about damage amounts from this flood.

Flash Flood in SCOTT, ILLINOIS
From 19-JUN-11 04:30:00 to 19-JUN-11 18:30:00 (CST-6)
Location: OXVILLE
Flood cause: Dam / Levee Break
Property damage: 100.00K
Crop damage: 750.00K
Reported by: Law Enforcement

A levee on the Mauvaise Terre Creek near Oxville broke in three places due to rapid streamflow from flooding upstream in Morgan County, and renewed heavy rain. The resulting flooding inundated State Route 100 north of I-72, covered nearly 2,000 acres of crops with water, and closed roads in and out of Oxville.
An 84 year old woman drove her car into the flood waters of the Mauvaise Terre Creek just before the levees failed. She was rescued and uninjured, but her car was damaged.

Flash Flood in EFFINGHAM, ILLINOIS
From 19-JUN-11 04:00:00 to 19-JUN-11 12:30:00 (CST-6)
Location: BEECHER CITY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Early morning thunderstorms with very heavy rainfall produced flash flooding in much of Effingham County for the second time in less than 24 hours. Reports indicated that 2.00 to 3.00 of rain occurred in areas with very saturated ground and where flash flooding has just receded. Many streets in Effingham were flooded, and most rural roads in the county were impassable.

Flash Flood in SHELBY, ILLINOIS
From 19-JUN-11 04:00:00 to 19-JUN-11 12:30:00 (CST-6)
Location: OCONEE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Early morning thunderstorms with very heavy rainfall produced flash flooding in extreme southern Shelby County for the second time in less than 24 hours. Reports indicated that 2.00 to 3.00 of rain occurred in areas with very saturated ground and where flash flooding has just receded. Illinois Route 128 south of Shelbyville was closed all morning, and most rural roads in the southern part of the county were impassable.

Flood in SANGAMON, ILLINOIS
From 18-JUN-11 21:33:00 to 19-JUN-11 17:30:00 (CST-6)
Location: BERLIN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The impacts of the flash flooding from the late evening of June 17th into the early morning of June 18th continued for another 20 hours in western Sangamon County. In addition, another 1.00 to 2.00 of rain fell over the flooded area from June 18th into the 19th.
During the afternoon of June 18th at 1:55 PM LST, a 75 year old man drove around a barricade into a flooded roadway on East Loami Road near the Lick Creek South Fork. He climbed to the top of the vehicle, but it was swept away by the rapid current. His truck was found in a nearby pond, but his body was not recovered until the morning of June 20th.
Many streets in Loami and New Berlin, and the rural roads and state highways in western parts of the county were flooded for almost 48 hours. The water finally receded on most roadways by early evening on June 19th.
See the Flash Flood entry for June 17th-18th for estimated damages due to this historic flooding.