After two rounds of heavy rain in the middle of May, major river flooding occurred on the Des Plaines, Illinois and Mazon Rivers.  Rainfall totals for May 14th to May 18th included 7.85 inches at Chicago O'Hare Airport (ORD); 6.66 inches at Waukegan Airport (UGN); 6.64 inches at DuPage Airport (DPA); 6.25 inches at Midway Airport (MDW); 5.43 inches at the National Weather Service office in Romeoville; 4.98 inches a Chicago Executive Airport (PWK); 4.53 inches at the Sugar Grove Airport (ARR) and 4.13 inches five miles southwest of Ottawa.

Flood in LA SALLE, ILLINOIS
From 17-MAY-20 15:00:00 to 20-MAY-20 21:00:00 (CST-6)
Location: SENECA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Major flooding occurred along portions of the Illinois River.  The river crested at 33.14 feet near La Salle on May 18th, which is the third highest crest on record near La Salle.  Flood stage near La Salle is 20 feet and major stage is 31 feet.  The river crested at 472.64 feet at Ottawa on May 18th, which is the second highest crest on record at Ottawa.  Flood stage at Ottawa is 463 feet and major stage is 471 feet.

Flood in GRUNDY, ILLINOIS
From 17-MAY-20 07:00:00 to 19-MAY-20 12:00:00 (CST-6)
Location: LANGHAM
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Major flooding occurred along the Illinois River.  The river crested at 24.85 feet at Morris on May 18th, which is the second highest crest on record at Morris.  Flood stage at Morris is 16 feet and major stage is 22 feet.  Numerous water rescues were reported along Cemetery Road.

Flood in GRUNDY, ILLINOIS
From 17-MAY-20 07:00:00 to 18-MAY-20 12:00:00 (CST-6)
Location: PAYTONVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Major flooding occurred along the Mazon River.  The river crested at 17.88 feet near Coal City on May 18th.  Flood stage near Coal City is 12 feet and major stage is 17 feet.  A water rescue was reported in the vicinity of Gardner.

Flood in LAKE, ILLINOIS
From 17-MAY-20 20:00:00 to 19-MAY-20 10:00:00 (CST-6)
Location: INDIAN CREEK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Major flooding occurred along the Des Plaines River.  The river crested at 15.73 feet at Lincolnshire on May 18th, which is the 4th highest crest on record.  Flood stage at Lincolnshire is 12.5 feet and major stage is 15.5 feet.

Flood in COOK, ILLINOIS
From 17-MAY-20 22:00:00 to 20-MAY-20 12:00:00 (CST-6)
Location: WHEELING
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Major flooding occurred along the Des Plaines River.  The river crested at 19.77 feet at Des Plaines on May 18th, which is the 5th highest crest on record at Des Plaines.  Flood stage at Des Plaines is 15 feet and major stage is 19 feet.

Flood in COOK, ILLINOIS
From 17-MAY-20 22:00:00 to 20-MAY-20 12:00:00 (CST-6)
Location: BROADVIEW
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Major flooding occurred along the Des Plaines River.  The river crested at 10 feet at Riverside on May 18th, which is the second highest crest on record.  Flood stage is 7.5 feet and major stage is 9 feet.