FloodZoneMap.org

Home› Stories› South Dakota› Flood 2019

Flood — Hamlin, SD

Apr 1, 2019

Flood Cause
Heavy Rain / Snow Melt

Snowmelt flooding, beginning in late March, continued throughout April on the Big Sioux River near Castlewood. A mid-April heavy snow/blizzard event added to the snowmelt runoff and flooding. The river remained well above the flood stage of 9 feet throughout April. The highest stage was moderate stage of 12.6 feet on March 28th. Some roads and cropland were flooded. The flooding continued into May.

Source: NOAA National Weather Service Storm Events Database (event 819393). Narrative written by NWS staff at the time of the event.

Flood Risk Context for Hamlin, SD

This event is one of many recorded floods in Hamlin County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.

View Hamlin County flood data →

More Flood Stories

Flood$202K damage

Hamlin, SD · Apr 1, 2019

The continuation of snowmelt from a much above normal snowfall winter combined with a historic heavy snow/blizzard in mid-April resulted in widespread flooding across central and northeast South Dakota.

Read the full account →
Flood$800K damage

Hamlin, SD · Apr 1, 2011

Snowmelt flooding in March continued across much of central and northeast South Dakota as the rest of the snowpack melted into early April. Many roads along with countless acres of crop and pastureland remained flooded.

Read the full account →
Flood$191K damage

Hamlin, SD · Apr 7, 2001

Heavy rain of 1 to 3 inches combined with snowmelt runoff brought flooding to parts of northeast South Dakota. Many roads across Clark, Grant, Hamlin, Deuel, and Roberts counties were flooded and damaged.

Read the full account →
Flood

Hamlin, SD · Jul 27, 2025

An afternoon thunderstorm developed near the town of Henry and very quickly spun up a violent tornado. This tornado would cause significant damage to a farmstead before dissipating.

Read the full account →