Heavy rain, combined with saturated ground from a summer of record rainfall, caused moderate to major flooding of the Big Sioux River beginning on September 22nd, and continuing to the end of the month. Flooding of numerous roads much farmland, and some homes was reported.

Flood in BROOKINGS, SOUTH DAKOTA
From 22-SEP-10 18:00:00 to 30-SEP-10 23:59:00 (CST-6)
Location: BRUCE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Widespread heavy rain, combined with saturated ground, caused a fairly rapid rise of the Big Sioux River to moderate to major flooding levels. Roads and numerous agricultural land near the river were flooded, as well as a few homes near the southern edge of the county, where the flooding was worse than further north. The river crested at 4.67 feet above flood stage at Brookings on September 25th.

Flood in LINCOLN, SOUTH DAKOTA
From 23-SEP-10 06:00:00 to 30-SEP-10 23:59:00 (CST-6)
Location: SIOUX FALLS
Flood cause: Heavy Rain
Property damage: 100.00K
Crop damage: 0.00K
Reported by: COOP Observer

Widespread heavy rain, combined with saturated ground, caused a fairly rapid rise of the Big Sioux River to moderate to major flooding levels. Roads and numerous agricultural land near the river were flooded, as well as a few homes. The river crested at 9.7 feet above flood stage at Hawarden, Iowa on September 27th.

Flood in MINNEHAHA, SOUTH DAKOTA
From 23-SEP-10 06:00:00 to 30-SEP-10 23:59:00 (CST-6)
Location: DELL RAPIDS
Flood cause: Heavy Rain
Property damage: 100.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Widespread heavy rain, combined with saturated ground, caused a fairly rapid rise of the Big Sioux River to moderate to major flooding levels. Roads and numerous agricultural land near the river were flooded, as well as a several homes, especially near Dell Rapids. Parkland in Sioux Falls was also flooded. The river crested at 5.59 feet above flood stage at the North Cliff Avenue gage in Sioux Falls on September 27th.

Flood in MOODY, SOUTH DAKOTA
From 23-SEP-10 06:00:00 to 30-SEP-10 23:59:00 (CST-6)
Location: FLANDREAU
Flood cause: Heavy Rain
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Widespread heavy rain, combined with saturated ground, caused a fairly rapid rise of the Big Sioux River to moderate to major flooding levels. Roads and numerous agricultural land near the river were flooded. Several homes near the river were flooded, and several people were evacuated. Damage to homes and some roads was reported, although the known damage was thought to be a small part of the total damage.

Flood in UNION, SOUTH DAKOTA
From 23-SEP-10 06:00:00 to 30-SEP-10 23:59:00 (CST-6)
Location: ALCESTER
Flood cause: Heavy Rain
Property damage: 100.00K
Crop damage: 0.00K
Reported by: COOP Observer

Widespread heavy rain, combined with saturated ground, caused a fairly rapid rise of the Big Sioux River to moderate to major flooding levels. Roads and numerous agricultural land near the river were flooded, as well as a few homes. A dike break just south of Big Springs caused additional farmland to be flooded. The river crested at 6.9 feet above flood stage near Akron, Iowa on September 27th.