An area of low pressure over northeastern Wyoming interacted with a stationary boundary across western South Dakota and produced slow moving thunderstorms. With ample low level moisture over the area, the thunderstorms produced torrential rainfall. Between three and six inches of rain fell across portions of Harding and northwestern Butte Counties on June 17. The runoff from these storms and additional rain on June 18 and 19 caused significant flooding across much of northwestern South Dakota.

Flood in BUTTE, SOUTH DAKOTA
From 17-JUN-14 18:30:00 to 19-JUN-14 13:00:00 (MST-7)
Location: CASTLE ROCK
Flood cause: Heavy Rain
Property damage: 100.00K
Crop damage: 0.00K
Reported by: County Official

Significant flooding occurred along Battle Creek, Fourmile Creek, Alkali Creek, Indian Creek, and the South Fork of the Moreau River. Several roads were flooded, including US Highway 85 between Belle Fourche and Redig, SD Highway 168, Harding Road, and Camp Crook Road.

Flood in HARDING, SOUTH DAKOTA
From 17-JUN-14 18:30:00 to 18-JUN-14 23:00:00 (MST-7)
Location: REVA
Flood cause: Heavy Rain
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Three to five inches of rain caused significant flooding along Alkali Creek, Rabbit Creek, and the South Fork of the Moreau River and their tributaries. Several roads were flooded, including Jefferson Road southeast of Reva, Harding Road, and Camp Crook Road.

Flood in PERKINS, SOUTH DAKOTA
From 18-JUN-14 10:00:00 to 19-JUN-14 17:45:00 (MST-7)
Location: LODGEPOLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Significant flooding occurred along Rabbit Creek, the South Fork of the Grand River, and Thunder Butte Creek and their tributaries and several small normally dry drainage areas in Perkins County. Several roads were flooded and damaged, including Sorum Dam Road and White Butte Road. A culvert on SD Highway 73 north of Thunder Butte Creek and south of SD highway 20 washed out, closing the highway. The river gauge on the Moreau River at Highway 73 crested at 17.3 feet, with a flow around 14,300 cfs, at 900 AM MST on June 19. Flood stage at this location is 16 feet.

Flood in PERKINS, SOUTH DAKOTA
From 20-JUN-14 05:45:00 to 20-JUN-14 23:00:00 (MST-7)
Location: USTA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The river gauge on the Moreau River at SD Highway 73 crested at 16.4 feet with a flow around 12,600 cfs at 130 PM MST on June 20. Flood stage at this location is 16.0 feet.

Flood in ZIEBACH, SOUTH DAKOTA
From 18-JUN-14 13:00:00 to 19-JUN-14 07:00:00 (MST-7)
Location: GLAD VALLEY
Flood cause: Heavy Rain
Property damage: 100.00K
Crop damage: 0.00K
Reported by: COOP Observer

Hail and over four inches of rain fell in less than 24 hours over northern Ziebach County, with the runoff causing significant flooding. Over 140 roads and culverts were flooded or damaged, including the road near Glad Valley Dam.

Flood in ZIEBACH, SOUTH DAKOTA
From 18-JUN-14 10:00:00 to 19-JUN-14 07:00:00 (MST-7)
Location: RED SCAFFOLD
Flood cause: Heavy Rain
Property damage: 200.00K
Crop damage: 0.00K
Reported by: Public

Flooding occurred along Bull Creek and Cherry Creek and its tributaries. Tankini and Red Scaffold Roads were flooded in a few locations. High water in Howes Grazing Lake and Lake Buffalo eroded the shoulder of SD Highway 34/73 between Bridger and Howes. The highway was closed for eight days while temporary repairs were made and both lakes were drained to more manageable levels. The highway was closed again in early August for five weeks so permanent repairs could be made.

Flood in MEADE, SOUTH DAKOTA
From 18-JUN-14 08:00:00 to 18-JUN-14 17:00:00 (MST-7)
Location: FAIRPOINT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Runoff from heavy rain flooded agricultural land and a few roads, including Fairpoint Road. A small dam breached, damaging a portion of Fairpoint Road.

Flash Flood in BUTTE, SOUTH DAKOTA
From 17-JUN-14 16:15:00 to 17-JUN-14 16:15:00 (MST-7)
Location: CASTLE ROCK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

Battle Creek flooded US Highway 85 north of Belle Fourche. A vehicle was swept away by the flowing water; one person had minor injuries but walked to the highway, the other was not found and is presumed dead.