South Dakota, 1998

Flooding in South Dakota, May 11 to 13, 1998

May 11 to 13, 1998 · NWS ABR · 6 events in 6 counties and zones

Heavy rain of 2 to 4 inches with some amounts nearing 5 inches fell across a large part of the six county area mainly on the evening of the 11th. This round of heavy rain only exacerbated the already extensive flooding occurring from many years of above normal precipitation.

Where it happened

Every event with a place to put it; 6 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.

  • Tornadoes
  • Tropical storms and surge
  • Floods
  • Wind
  • Hail
  • Winter weather
  • Heat and drought
  • Cold
  • Fire, smoke and dust
  • Marine and coastal
  • Other

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The toll

Deaths
0
Injuries
0
Property damage
$3.8 million
Crop damage
None recorded
Events
6

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.

What happened

The episode as NWS ABR wrote it up.

Heavy rain of 2 to 4 inches with some amounts nearing 5 inches fell across a large part of the six county area mainly on the evening of the 11th. This round of heavy rain only exacerbated the already extensive flooding occurring from many years of above normal precipitation. Day county was most affected by this round of heavy rain where area lakes were already at new record levels. Blue Dog, Waubay, Rush, and Bitter Lake in Day County were just a few of the lakes hard hit again. In fact, extensive sandbagging was done around Blue Dog Lake to save many homes. Some residents of Blue Dog Lake said they had never seen the lake so high in over 35 years of living there. Many more roads became flooded after this heavy rain event and will remain so for quite some time. Spots on US Highway 12 and US Highway 25 became flooded near Holmquist and Webster. Also, more of US Highway 212 4 miles east of Clark was flooded. Many area roads had to once again be built up. There remained only one road open to the town of Grenville in northeast Day County. Mail was delayed to many areas due to the road problems. Some school bus drivers said they had never seen rural gravel roads this bad. Also, some railroad tracks were washed out. In all six counties, the rising water took away many more acres of farm and pastureland, as well as drowning many crops that had already been planted. One farmer in Spink County said sixty percent of his farm was under water. Many farmers were unable to reach their fields because of the flooding. Some farmhouses and outbuildings became surrounded by water leaving some families stranded. After this heavy rain, around sixty percent of the crop and pastureland in Day county and one-third of it in Spink county had been inundated by a swollen water table and several years of above normal precipitation. Overall, the continued flooding has had a tremendous impact on the economy in the six county area. In April, Marshall, Day, Clark, Roberts, and Spink counties were all declared disaster areas as a result of the flooding. Some rainfall amounts included, 2.18 at Aberdeen, 2.29 5NE Peever, 2.41 at Clark, 2.60 at Groton, 2.63 at Conde, 3.10 at Sisseton, 3.60 at Turton, 3.81 at Waubay NWR, 4.01 at Doland, 4.52 at Webster, and 4.7 inches just north of Crocker in Clark county.

The radar

The national radar mosaic for the moment the first event began.

Open the radar archive at this moment

Event by event

6 flood. Local standard time, as filed.

Flood, Day

When
May 11, 6:00 PM CST to May 13, 6:00 AM CST
Where
Day forecast zone
Property damage
$1.9 million
Reported by
NEWSPAPER
Coordinates
45.367, -97.607 (the zone’s center; the record gives no point)

Flood, Spink

When
May 11, 6:00 PM CST to May 13, 6:00 AM CST
Where
Spink forecast zone
Property damage
$310,000
Reported by
NEWSPAPER
Coordinates
44.938, -98.346 (the zone’s center; the record gives no point)

Flood, Clark

When
May 11, 6:00 PM CST to May 13, 6:00 AM CST
Where
Clark forecast zone
Property damage
$260,000
Reported by
NEWSPAPER
Coordinates
44.858, -97.729 (the zone’s center; the record gives no point)

Flood, Marshall

When
May 11, 6:00 PM CST to May 13, 6:00 AM CST
Where
Marshall forecast zone
Property damage
$320,000
Reported by
NEWSPAPER
Coordinates
45.759, -97.598 (the zone’s center; the record gives no point)

Flood, Brown

When
May 11, 6:00 PM CST to May 13, 6:00 AM CST
Where
Brown forecast zone
Property damage
$460,000
Coordinates
45.590, -98.352 (the zone’s center; the record gives no point)

Flood, Roberts

When
May 11, 6:00 PM CST to May 13, 6:00 AM CST
Where
Roberts forecast zone
Property damage
$580,000
Reported by
EMERGENCY MANAGER
Coordinates
45.630, -96.946 (the zone’s center; the record gives no point)

What these are

Flood
Flooding that develops more slowly than a flash flood: rivers leaving their banks, or water standing over land for an extended time.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

More

Every storm in South Dakota in 1998Every state in 1998This day in weather historyWarnings in South Dakota, May 1998

Sources

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 2026-09-30. Each event’s entry at NCEI: 5646749, 5646750, 5646751, 5646752, 5646753, 5646754.