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USGS CMG InfoBank: Low Sill Structure

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Comment: 17:32 - 18:25 (00:53)
Source: Annenberg/CPB Resources - Earth Revealed - 20. Running Water II: Landscape Evolution
Keywords: "Old River", dam, "U.S. Army Corps of Engineers", "Old River Control Project", river, "Mississippi River", "Atchafalaya River", flow-rate, floodplain, flood

Our transcription: The Low Sill Structure is 566 feet wide and has 11 gates which allow the Corps to control the flow rate.
The Low Sill sits on a manmade Outflow Channel connecting the Mississippi to the Atchafalaya.
On the floodplain next to the Low Sill Structure sits an emergency facility, the Overbank Structure, built to assist the Low Sill during major floods.
Well over a half mile long, it has 73 gates.
For a time this elaborate and costly system managed to keep the Mississippi in place.
But in 1973, ten years after the system went on line, the Corps efforts were tested to their limits.

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Page Last Modified: Thu Oct 31 04:28:10 PDT 2013  (chd)