Primed by 1 to 3 inches of rainfall on June 17-18, starting June 20, the area was impacted adversely by several very slow moving mid-level waves which drifted across the northern and central Plains during the following week. High precipitable water and persistent lift forcing resulted in a widespread 4 to 9 inches of rainfall, inundating crop and pasture land as well as several roads.

Flood in LYON, IOWA
From 21-JUN-18 01:00:00 to 29-JUN-18 22:00:00 (CST-6)
Location: KLONDIKE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

A week of periodic heavy rainfall ending June 26 resulted in a widespread 5 to 9 inches of rainfall, much of which occurred on June 20 and 25. Specific weekly totals included 6.28 inches near Larchwood, 7.47 inches at Canton, 8.14 inches near Garretson, 9.19 inches near Lester and a variety of reports from 5 to 7 inches around the Sioux Falls metro area. Major flooding occurred with significant amounts of crop and pasture land inundated as the river crested near Canton (gage site CBSS2) 7.2 feet above flood stage on June 22. After falling, a second crest 4.0 feet above flood stage occurred on June 27. The river dropped below flood stage on June 29.

Flood in LYON, IOWA
From 21-JUN-18 01:00:00 to 29-JUN-18 06:00:00 (CST-6)
Location: GRANITE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

A week of periodic heavy rainfall ending June 26 resulted in a widespread 3 to 7 inches of rainfall, much of which occurred on June 20 and 25. Specific weekly totals included 3.44 inches at Flandreau, 4.08 inches 6 miles north of Dell Rapids, 4.62 inches at Colton, 8.14 inches near Garretson, 5.67 inches near Hartford, 6.28 inches near Larchwood and a variety of reports from 5 to 7 inches around the Sioux Falls metro area. Minor flooding occurred with significant amounts of crop and pasture land inundated as the river crested near Brandon (gage site BBBS2) 2.8 feet above flood stage on June 22. The river dropped below flood stage on June 24, but returned above flood stage with minor flooding (0.5 feet above flood stage) again on June 28 before falling back below flood stage on June 29.

Flood in SIOUX, IOWA
From 21-JUN-18 01:00:00 to 29-JUN-18 22:00:00 (CST-6)
Location: FAIRVIEW
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

A week of periodic heavy rainfall ending June 26 resulted in a widespread 5 to 9 inches of rainfall, much of which occurred on June 20 and 25. Specific weekly totals included 6.28 inches near Larchwood, 7.47 inches at Canton, 8.14 inches near Garretson, 9.19 inches near Lester and a variety of reports from 5 to 7 inches around the Sioux Falls metro area. Major flooding occurred with significant amounts of crop and pasture land inundated as the river crested near Canton (gage site CBSS2) 7.2 feet above flood stage on June 22. After falling, a second crest 4.0 feet above flood stage occurred on June 27. The river dropped below flood stage on June 29.

Flood in SIOUX, IOWA
From 21-JUN-18 03:00:00 to 30-JUN-18 23:59:00 (CST-6)
Location: LEBANON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

A week of periodic heavy rainfall ending June 26 resulted in a widespread 5 to 9 inches of rainfall, much of which occurred on June 20, 24 and 25. Specific weekly totals included 6.28 inches near Larchwood, 7.47 inches at Canton, 9.15 inches at Rock Valley, 9.19 inches near Lester and 5.01 inches at Hawarden. Major flooding occurred with South Dakota Highway 46 and Iowa Highway 10 going under water, as well as the city park in Hawarden. Significant amounts of crop and pasture land were inundated as the river crested above Hawarden (gage site HWDS2) 13.5 feet above flood stage on June 22. After falling, a second crest 10.8 feet above flood stage occurred on June 27. The river remained at minor flood stage at months end.

Flood in PLYMOUTH, IOWA
From 21-JUN-18 13:00:00 to 30-JUN-18 23:59:00 (CST-6)
Location: AKRON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

A week of periodic heavy rainfall ending June 26 resulted in a widespread 5 to 9 inches of rainfall, much of which occurred on June 20, 24 and 25. Specific weekly totals included 7.47 inches at Canton, 9.15 inches at Rock Valley, 4.47 inches at Akron and 5.01 inches at Hawarden. Major flooding occurred with South Dakota Highways 48 and 50 as well as Iowa Highway 12 going under water. Significant amounts of crop and pasture land were inundated as the river crested at Akron (gage site AKRI4) 7.5 feet above flood stage on June 23. After falling, a second crest 6.2 feet above flood stage occurred on June 28. The river remained at moderate flood stage at months end.

Flood in PLYMOUTH, IOWA
From 21-JUN-18 21:00:00 to 30-JUN-18 23:59:00 (CST-6)
Location: WESTFIELD
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

A week of periodic heavy rainfall ending June 26 resulted in a widespread 5 to 9 inches of rainfall, much of which occurred on June 20, 24 and 25. Specific weekly totals included 7.47 inches at Canton, 9.15 inches at Rock Valley, 4.47 inches at Akron and 5.01 inches at Hawarden. Major flooding occurred with South Dakota Highway 50 as well as Iowa Highway 3 going under water. Significant amounts of crop and pasture land were inundated as the river crested near Richland (gage site BSRS2) 7.4 feet above flood stage on June 24. The river remained at major flood stage at months end.

Flood in PLYMOUTH, IOWA
From 24-JUN-18 04:00:00 to 30-JUN-18 23:59:00 (CST-6)
Location: MILLNERVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

A week of periodic heavy rainfall ending June 26 resulted in a widespread 5 to 9 inches of rainfall, much of which occurred on June 20, 24 and 25. Specific weekly totals included 7.47 inches at Canton, 9.15 inches at Rock Valley, 4.47 inches at Akron, 5.01 inches at Hawarden and 5.51 inches 6 miles north northeast of Jefferson. Minor flooding occurred with significant amounts of crop and pasture land inundated as the river crested near Jefferson (gage site BSJS2) 7.4 feet above flood stage on June 26. The river remained at minor flood stage at months end.