Extensive flooding occurred late May and into June across eastern Iowa, northwest Illinois, and northeast Missouri.  The last half of May was very wet with 5-8 inches of rain falling over the region.  This combined with saturated soils, brought many rivers above Moderate to Major flood levels.  Many climate sites only saw 3 days of no precipitation from May 16th to May 31st.
The Wapsipinicon, Iowa, Skunk, Des Moines, Rock, and Green Rivers all recorded a preliminary Top 10 crest on record.  The main stem Mississippi also crested again in late May / early June, with sites from Le Claire LD 14 on downstream recording a Top 10 crest.
Several significant flood events also occurred in March - Early May 2019 due to snowmelt, heavy rain, and saturated soil.

Flood in MCDONOUGH, ILLINOIS
From 26-MAY-19 08:40:00 to 26-MAY-19 13:00:00 (CST-6)
Location: COLMAR
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Other Federal Agency

The La Moine River at Colmar rose above its major flood stage of 24 feet during the morning hours of May 26th and fell back below major flood stage during the early afternoon. The river crested at 24.06 feet around 11 AM on the 26th.

Flood in HENRY, ILLINOIS
From 31-MAY-19 08:30:00 to 31-MAY-19 23:59:00 (CST-6)
Location: SPRING HILL
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Other Federal Agency

The Rock River at Joslin rose above its major flood stage of 16.5 early in the morning on May 31st and continued to rise through the remainder of the day. This flooding continued into June.

Flood in ROCK ISLAND, ILLINOIS
From 31-MAY-19 08:30:00 to 31-MAY-19 23:59:00 (CST-6)
Location: JOSLIN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Other Federal Agency

The Rock River at Joslin rose above its major flood stage of 16.5 early in the morning on May 31st and continued to rise through the remainder of the day. This flooding continued into June.

Flood in ROCK ISLAND, ILLINOIS
From 29-MAY-19 04:00:00 to 31-MAY-19 23:59:00 (CST-6)
Location: BLACKHAWK STATE PARK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Other Federal Agency

The Rock River at Moline rose above its major flood stage of 14.0 early in the morning on May 29th and continued to rise through the remainder of the day. This flooding continued into June.

Flood in HENDERSON, ILLINOIS
From 29-MAY-19 10:00:00 to 31-MAY-19 23:59:00 (CST-6)
Location: LOMAX
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Other Federal Agency

The Mississippi River at Gregory Landing rose above its major flood stage of 25 feet around 10 AM on May 29th and remained above its major flooding through the end of the month. This flooding continued into June.

Flood in ROCK ISLAND, ILLINOIS
From 28-MAY-19 01:00:00 to 31-MAY-19 23:59:00 (CST-6)
Location: BUFFALO PRAIRIE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The Mississippi River at Muscatine (MUSI4) rose above its major flood stage of 20 feet during the early morning of May 28th and continued into June. The river crested in June, with the stage rising to 24.0 feet at the end of May 31st.

Flood in ROCK ISLAND, ILLINOIS
From 27-MAY-19 16:00:00 to 31-MAY-19 23:59:00 (CST-6)
Location: ILLINOIS CITY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The Mississippi River at Illinois City Lock and Dam 16 rose above its major flood stage of 18 feet during the afternoon of May 27th and continued into June. The river crested in June, with the stage rising to 21.45 feet at the end of May 31st.

Flood in ROCK ISLAND, ILLINOIS
From 27-MAY-19 15:00:00 to 31-MAY-19 23:59:00 (CST-6)
Location: ANDALUSIA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The Mississippi River at Rock Island Lock and Dam 15 rose above its major flood stage of 18 feet during the afternoon of May 27th and continued into June. The river crested in June, with the stage rising to 21.4 feet at the end of May 31st.

Flood in ROCK ISLAND, ILLINOIS
From 29-MAY-19 11:00:00 to 31-MAY-19 23:59:00 (CST-6)
Location: RAPIDS CITY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The Mississippi River at Le Claire Lock and Dam 14 rose above its major flood stage of 13.5 feet during the morning of May 29th and continued into June. The river crested in June, with the stage rising to 15 feet at the end of May 31st.

Flood in WHITESIDE, ILLINOIS
From 30-MAY-19 08:00:00 to 31-MAY-19 23:59:00 (CST-6)
Location: ALBANY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The Mississippi River at Camanche (CMMI4) rose above its major flood stage of 20.5 feet during the morning of May 30th and continued into June. The river crested in June, with the stage rising to 21.1 feet at the end of May 31st.