Thunderstorms developed along the eastern slopes of the Black Hills and adjacent plains from Nisland to Sturgis to the Rapid City area. As these storms moved toward the northwest, they redeveloped and became stationary over the eastern foothills. As much as six inches of rain fell in a few hours. Flash flooding was reported in Rapid City; Sturgis; and rural areas of Butte, Meade, and Pennington Counties. Runoff from the rainfall quickly inundated city streets, overflowed small creeks, and breached a few private stock dams.

Flash Flood in BUTTE, SOUTH DAKOTA
From 29-MAY-13 17:20:00 to 29-MAY-13 21:00:00 (MST-7)
Location: BELLE FOURCHE RESERVOIR
Flood cause: Heavy Rain
Property damage: 150.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Three to five inches of rain fell in a few hours and caused flash flooding in southeastern Butte County. Willow Creek, Horse Creek, Indian Creek, and Whitewood Creek quickly rose over their banks. At least two private stock dams failed southeast of Nisland. Numerous roads, culverts, and fences were damaged.

Flood in BUTTE, SOUTH DAKOTA
From 29-MAY-13 21:00:00 to 30-MAY-13 09:30:00 (MST-7)
Location: CASTLE ROCK
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Emergency Manager

After heavy during the early evening caused flash flooding in south central Butte County, additional rain overnight exacerbated the flooding. High water from several tributaries caused minor flooding along the Belle Fourche River, which was two feet deep over the Bismark Bridge east of Vale.

Flash Flood in MEADE, SOUTH DAKOTA
From 29-MAY-13 17:30:00 to 29-MAY-13 21:00:00 (MST-7)
Location: STURGIS
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Three to five inches of rain fell in a few hours and caused flash flooding east of Interstate 90 in southwestern Meade County. Street flooding was reported in Sturgis and several rural roads north of Sturgis were inundated.

Flood in MEADE, SOUTH DAKOTA
From 29-MAY-13 21:00:00 to 30-MAY-13 11:00:00 (MST-7)
Location: STURGIS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

High water in small tributaries produced minor flooding along the Belle Fourche River.

Flash Flood in PENNINGTON, SOUTH DAKOTA
From 29-MAY-13 17:20:00 to 29-MAY-13 21:00:00 (MST-7)
Location: RAPID CITY
Flood cause: Heavy Rain
Property damage: 300.00K
Crop damage: 0.00K
Reported by: NWS Employee

Two to six inches of rain caused flash flooding in the Rapid City area. Rapid Creek overflowed its banks and flooded portions of the bike path and several roads. Flooding was reported along Sheridan Lake Road in the Spring Brook Acres area. Fifth Street was flooded between Minnesota Street and Catron Boulevard. Arrowhead and Meadowbrook golf courses were flooded and a cart bridge was destroyed. Water was three feet high against Meadowbrook Elementary School. A few structures along Rapid Creek were flooded near South Valley Drive.

Flood in PENNINGTON, SOUTH DAKOTA
From 29-MAY-13 21:00:00 to 30-MAY-13 11:00:00 (MST-7)
Location: RAPID CITY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Other Federal Agency

Rapid Creek overflowed its banks and flooded portions of the bike path and several roads after thunderstorms dropped two to six inches of rain in a few hours. Flooding continued overnight in Rapid Valley. A few structures were flooded near South Valley Drive and Green Valley Drive.