A strong upper level wave combined with abundant moisture to produce strong thunderstorms over western South Dakota. Torrential rain of two to four inches fell across the eastern and southern slopes of the Black Hills in a brief period, causing flooding from Piedmont southward to the Nebraska border. Flood waters continued downstream on the Cheyenne River to the Missouri River.

Flash Flood in CUSTER, SOUTH DAKOTA
From 24-MAY-10 15:02:00 to 24-MAY-10 19:00:00 (MST-7)
Location: CUSTER STATE PARK
Flood cause: Heavy Rain
Property damage: 200.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Heavy rain caused flash flooding along the eastern Custer County foothills. Flooding was reported on Iron Creek, Battle Creek, Grace Coolidge Creek, Lame Johnny Creek, French Creek, and Beaver Creek. Several County roads were damaged from the flooding.

Flood in PENNINGTON, SOUTH DAKOTA
From 24-MAY-10 19:00:00 to 25-MAY-10 11:00:00 (MST-7)
Location: CREIGHTON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Flooding was reported from Rapid City to Farmingdale and along Rapid Creek. A couple of homes were surrounded by water and several county roads were flooded.

Flood in MEADE, SOUTH DAKOTA
From 24-MAY-10 19:00:00 to 25-MAY-10 17:00:00 (MST-7)
Location: PIEDMONT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Flooding was reported in southern Meade County along Elk Creek, Antelope Creek, and Box Elder Creek. A few homes reported water in their basements and several county roads were flooded.

Flood in CUSTER, SOUTH DAKOTA
From 24-MAY-10 19:00:00 to 25-MAY-10 18:00:00 (MST-7)
Location: HERMOSA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Flooding was reported along streams in eastern Custer County foothills including Iron Creek, Battle Creek, Grace Coolidge Creek, Lame Johnny Creek, French Creek, and Beaver Creek. Several county roads were damaged from the flooding.

Flood in ZIEBACH, SOUTH DAKOTA
From 25-MAY-10 08:00:00 to 27-MAY-10 01:30:00 (MST-7)
Location: BRIDGER
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Other Federal Agency

Minor flooding occurred along the Cheyenne River.

Flash Flood in PENNINGTON, SOUTH DAKOTA
From 24-MAY-10 14:09:00 to 24-MAY-10 19:00:00 (MST-7)
Location: JOHNSON SIDING
Flood cause: Heavy Rain
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Heavy rain caused flash flooding from Rapid City to Farmingdale and in Keystone. Rapid Creek on the east side of Rapid City rose quickly and flooding was reported along the creek. A couple of homes were surrounded by water, several county roads were flooded, and a few basements flooded in Keystone.

Flash Flood in MEADE, SOUTH DAKOTA
From 24-MAY-10 14:45:00 to 24-MAY-10 19:00:00 (MST-7)
Location: PIEDMONT
Flood cause: Heavy Rain
Property damage: 150.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Heavy rain caused flash flooding in southern Meade County from Black Hawk to Elm Springs. Flash flooding was reported along Elk Creek, Antelope Creek, and Box Elder Creek. A few homes reported water in their basements and several county roads were flooded.

Flood in FALL RIVER, SOUTH DAKOTA
From 24-MAY-10 15:45:00 to 25-MAY-10 18:00:00 (MST-7)
Location: HOT SPRINGS
Flood cause: Heavy Rain
Property damage: 75.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Heavy rain caused flooding along the Fall River, Horsehead Creek, Hat Creek, Beaver Creek, and other smaller creeks and streams in Fall River County. The low water crossings in Hot Springs at South Sixth Street and at Joplin Avenue were flooded as well as several county roads. The creeks and streams were so high that Angostura Reservoir filled up and over 5900 cfs was being released. This was the first time in 10 years that Angostura Reservoir was full. The saturated soil and gusty winds also helped to bring down several large trees in Hot Springs.

Flood in HAAKON, SOUTH DAKOTA
From 25-MAY-10 08:00:00 to 27-MAY-10 01:30:00 (MST-7)
Location: MILESVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Other Federal Agency

Minor flooding occurred along the Cheyenne River.