Spurred by a period of excessive precipitation from September 10-12 that resulted in 5 to 10 inches of rainfall in the middle to upper reaches of the Big Sioux River basin and 2 to 5 inches from Sioux Falls downstream, extreme rises occurred mid-month, with many basin locations reaching record stages.

Flood in LYON, IOWA
From 12-SEP-19 06:00:00 to 25-SEP-19 21:00:00 (CST-6)
Location: KLONDIKE
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

After excessive two-day rainfall during September 10-12 (8.74 inches at Flandreau, 7.81 inches at Dell Rapids and generally 3 to 4 inches around Sioux Falls), the Big Sioux River above Canton (gage site CBSS2) reached the second highest stage on record of 10.88 feet above flood stage on September 13. Significant amounts of rural flooding occurred, and high water forced brief closure of U.S. Highway 18 east of Canton.

Flood in SIOUX, IOWA
From 12-SEP-19 08:30:00 to 26-SEP-19 21:00:00 (CST-6)
Location: HAWARDEN
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

After excessive two-day rainfall during September 10-12 (7.81 inches at Dell Rapids, generally 3 to 4 inches around Sioux Falls, 4.72 inches at Canton), the Big Sioux River above Hawarden (gage site HWDI4) reached the third highest stage on record of 12.33 feet above flood stage on September 15. Significant amounts of the agricultural flood plain were inundated, and numerous roads were closed including South Dakota Highway 46, Iowa Highway 10 and South Dakota county road 13.

Flood in PLYMOUTH, IOWA
From 13-SEP-19 10:00:00 to 28-SEP-19 22:00:00 (CST-6)
Location: WESTFIELD
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

After excessive two-day rainfall during September 10-12 (generally 3 to 4 inches around Sioux Falls, 4.72 inches at Canton, 2.51 inches at Hawarden), the Big Sioux River near Richland (gage site BSRS2) reached the 3rd highest stage on record of 6.51 feet above flood stage on September 17. Significant amounts of the agricultural flood plain were inundated, and numerous roads were closed including South Dakota Highway 50 and Iowa Highway 3.

Flood in PLYMOUTH, IOWA
From 12-SEP-19 16:30:00 to 28-SEP-19 15:00:00 (CST-6)
Location: AKRON
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

After excessive two-day rainfall during September 10-12 (7.81 inches at Dell Rapids, generally 3 to 4 inches around Sioux Falls, 4.72 inches at Canton), the Big Sioux River at Akron (gage site AKRI4) reached the 9th highest stage on record of 6.28 feet above flood stage on September 16. Significant amounts of the agricultural flood plain were inundated, and numerous roads were closed including South Dakota Highway 48 and Iowa Highways 12 and 3.

Flood in PLYMOUTH, IOWA
From 16-SEP-19 05:00:00 to 23-SEP-19 01:00:00 (CST-6)
Location: MILLNERVILLE
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

After excessive two-day rainfall during September 10-12 (generally 3 to 4 inches around Sioux Falls, 4.72 inches at Canton, 2.51 inches at Hawarden), the Big Sioux River near Jefferson (gage site BSJS2) reached the 3rd highest stage on record of 5.83 feet above flood stage on September 18. Significant amounts of the agricultural flood plain were inundated, and numerous county roads were closed including the bridge over the Big Sioux River on County Road 7.

Flood in LYON, IOWA
From 11-SEP-19 06:00:00 to 30-SEP-19 23:59:00 (CST-6)
Location: GRANITE
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

After excessive two-day rainfall during September 10-12 (8.74 inches at Flandreau, 7.81 inches at Dell Rapids and generally 3 to 4 inches around Sioux Falls), the Big Sioux River near Brandon (gage site BBSS2) reached the highest stage on record of 9.53 feet above flood stage on September 14. Significant amounts of rural flooding occurred, with inundation of much of the Big Sioux Recreation Area and lower trails in Good Earth and Gitchie Manitou State Parks. Minor flooding continued at the end of the month.

Flood in SIOUX, IOWA
From 12-SEP-19 06:00:00 to 25-SEP-19 21:00:00 (CST-6)
Location: FAIRVIEW
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

After excessive two-day rainfall during September 10-12 (8.74 inches at Flandreau, 7.81 inches at Dell Rapids and generally 3 to 4 inches around Sioux Falls), the Big Sioux River above Canton (gage site CBSS2) reached the second highest stage on record of 10.88 feet above flood stage on September 13. Significant amounts of rural flooding occurred, and high water forced brief closure of U.S. Highway 18 east of Canton.

Flood in SIOUX, IOWA
From 12-SEP-19 10:00:00 to 25-SEP-19 20:00:00 (CST-6)
Location: FAIRVIEW
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

After excessive two-day rainfall during September 10-12 (7.81 inches at Dell Rapids, generally 3 to 4 inches around Sioux Falls, 4.72 inches at Canton), the Big Sioux River at Fairview (gage site FVWS2) reached the highest stage on record of 11.14 feet above flood stage on September 14. Significant amounts of the agricultural flood plain were inundated.

Flood in LYON, IOWA
From 12-SEP-19 14:00:00 to 16-SEP-19 10:00:00 (CST-6)
Location: ROCK RAPIDS MUNI ARP
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

After excessive two-day rainfall during September 10-12 (4.72 inches at Luverne and 3.43 inches at Rock Rapids), the Rock River at Rock Rapids (gage site RAPI4) reached the third highest stage on record of 8.54 feet above flood stage on September 14. Significant agricultural land was flooded, with numerous county roads under water.

Flood in LYON, IOWA
From 14-SEP-19 16:00:00 to 15-SEP-19 08:00:00 (CST-6)
Location: ALVORD
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

After excessive two-day rainfall during September 10-12 (4.72 inches at Luverne and 3.43 inches at Rock Rapids), the Rock River at Rock Valley (gage site RKVI4) reached a minor crest of 0.79 feet above flood stage on September 14. Significant agricultural land was flooded along with several county roads.

Flood in SIOUX, IOWA
From 14-SEP-19 16:00:00 to 15-SEP-19 08:00:00 (CST-6)
Location: ROCK VLY
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

After excessive two-day rainfall during September 10-12 (4.72 inches at Luverne and 3.43 inches at Rock Rapids), the Rock River at Rock Valley (gage site RKVI4) reached a minor crest of 0.79 feet above flood stage on September 14. Significant agricultural land was flooded along with several county roads.