Big Sioux River near Castlewood

The past week

What floods at each level

• 18 ft

  479th Avenue begins to flood south of Castlewood.

• 17 ft

  Highway 22 begins to flood, as does 181st Street, and water reaches the bottom of the bridge on 459th Avenue south of Castlewood.

• 16 ft

  The river will be about 1 mile wide and many farm buildings around Castlewood will be flooded.

• 15 ft

  The water reaches the bottom of the bridges on Highway 22 and 181st Street.

• 13 ft

  Major agricultural flooding begins south of Castlewood.

• 11 ft

  Significant amounts of pasture and other agricultural lands will be flooded.

• 10 ft

  184th Street begins to flood.

• 9 ft

  Water overtops the culvert on 184th Street and significant agricultural flooding begins north of Castlewood.

• 8 ft

  Minor flooding of low-lying agricultural lands along the river will begin.

Highest crests on record

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