The Missouri River, which had been near flood stage in many areas, began a significant rise near the end of the month in response to widespread upstream heavy rain which fell after unusually large upstream snowmelt. Flooding reached the moderate category by the end of May with the river on the way up across its length.

Flood in BON HOMME, SOUTH DAKOTA
From 20-MAY-11 06:00:00 to 31-MAY-11 23:59:00 (CST-6)
Location: PERKINS
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Flooding along the Missouri River developed and then increased in late May as runoff from excessive upstream snowmelt and rain reached the area. Lowlands flooded included camping and other recreational facilities including marinas next to Springfield. Roads flooded included some outlying Springfield streets. The river reached its highest May stage at about 3 feet above flood stage near Springfield and near Niobrara, Nebraska at the end of the month.

Flood in YANKTON, SOUTH DAKOTA
From 25-MAY-11 06:00:00 to 31-MAY-11 23:59:00 (CST-6)
Location: UTICA
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Flooding along the Missouri River developed and then increased in late May as runoff from excessive upstream snowmelt and rain reached the area. Lowlands flooded included some roads near the River away from Lewis and Clark Lake. The river reached its highest May levels at the end of the month.

Flood in UNION, SOUTH DAKOTA
From 25-MAY-11 06:00:00 to 31-MAY-11 23:59:00 (CST-6)
Location: JUNCTION CITY
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Flooding along the Missouri River developed and then increased in late May as runoff from excessive upstream snowmelt and rain reached the area. Lowlands flooded included some roads and recreational facilities near the river, including part of a golf course at Dakota Dunes. The river reached its highest May levels at the end of the month, including a peak stage 2.5 feet above flood stage at Ponca, Nebraska.

Flood in CLAY, SOUTH DAKOTA
From 25-MAY-11 06:00:00 to 31-MAY-11 23:59:00 (CST-6)
Location: MECKLING
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Flooding along the Missouri River developed and then increased in late May as runoff from excessive upstream snowmelt and rain reached the area. Lowlands flooded included a few roads near the River. The river reached its highest May levels at the end of the month.

Flood in CHARLES MIX, SOUTH DAKOTA
From 20-MAY-11 06:00:00 to 31-MAY-11 23:59:00 (CST-6)
Location: ACADEMY
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Flooding along the Missouri River developed and then increased in late May as runoff from excessive upstream snowmelt and rain reached the area. Lowlands flooded included camping and other recreational facilities, as well as some roads. The river reached its highest May stage at 3.2 feet above flood stage near Greenwood at the end of the month.

Flood in BRULE, SOUTH DAKOTA
From 20-MAY-11 06:00:00 to 31-MAY-11 23:59:00 (CST-6)
Location: CHAMBERLAIN ARPT
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Flooding along the Missouri River developed and then increased in late May as runoff from excessive upstream snowmelt and rain reached the area. Lowlands flooded included camping and other recreational facilities, as well as some roads.