Moderate to heavy rainfall occurred across a broad portion of Stanley and Dewey counties. 06 over 3 days.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS ABR wrote it up.
Moderate to heavy rainfall occurred across a broad portion of Stanley and Dewey counties. The COOP observer 3 miles west southwest of Wendt would record a 2 day total of 4.94 while the CoCoRaHS observer in Fort Pierre received 4.06 over 3 days. This area had also received about an inch of rainfall on or around the 15th. Rainfall and saturated soils resulted in flooding of several streams and creeks, including the Bad River between Wendt and Fort Pierre, and Virgin Creek near Promise. Shelters were opened for homeowners impacted by rises in the Bad River in Fort Pierre, with portions of Bad River road seeing damage due to washouts. A stretch of BIA 8 east of Eagle Butte was also partly washed out.
The national radar mosaic for the moment the first event began.
4 flood. Local standard time, as filed.
Tribal Officials report that the culvert on BIA Rt 8 has partly washed out. Travel through the area was difficult.
Stanley County Emergency Manager reports that Bad River Road has water over it in multiple locations and that residents were advised not to travel across parts of the county.
The Bad River river gauge at Fort Pierre would go into flood at 1230 CST, cresting at 24.14 or 3.14 feet above flood stage. The river would remain in flood into the morning of September 19th. At its crest, water was into some mobile homes along highway 83 in Fort Pierre, and the local shelter at the Expo Center was opened for those impacted.
The Stanley County Emergency Manager reports water over the roadway along US-14/SD-34 5 miles west of Hayes.
The river gauge on the Little Moreau at Promise went above flood stage on the afternoon of September 18th, topping out at 23.03 feet (2.03 feet above flood stage) during the early morning hours of September 19th. The river fell below flood stage later that afternoon. Virgin Creek, which flows into the Little Moreau just before they enter the Missouri River, was flowing across Promise Road at a depth of over one foot.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in South Dakota in 2025Every state in 2025This day in weather historyWarnings in South Dakota, September 2025
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-10-01. Each event’s entry at NCEI: 1292962, 1292965, 1292967, 1292970.