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Flash Flood — Custer, SD

May 20, 2016

Flood Cause
Heavy Rain

Slow moving thunderstorms regenerated over the Keystone and Mount Rushmore area for several hours. These storms produced large amounts of hail to two inches in diameter and three to four inches of rain in about three hours. Flooding occurred along creeks, covering several roads in the Keystone area and Custer State Park.

Source: NOAA National Weather Service Storm Events Database (event 630183). Narrative written by NWS staff at the time of the event.

Flood Risk Context for Custer, SD

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

View Custer County flood data →

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