Mallard Island

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Mallard Island and the Largest Flood Event Since
1997
Nicole David Lester McKee San Francisco Estuary
Institute
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Hillcrest
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Shasta Dam
Sacramento River Flood Control System
Freeport
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Sampling Events
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• December 25-28, 2005
• First Flush sampled at Mallard Island, 9
  samples 1 duplicate
• January 2-18, 2006
• Contingency Budget used for 14 samples 1
  duplicate for flood event

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Item 2a
Sacramento River at Freeport
88,000 cfs
Data from 12/30/2005 through 01/18/2006    
Duration 19days
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Yolo Bypass near Woodland
268,000cfs
Data from 12/30/2005 through 01/18/2006    
Duration 19days
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Yolo Bypass
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Cache Creek
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Delta Outflow from 12/25/05 to 01/25/06
370,000 cfs
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Cross Section Survey Tuesday, January 10, 2006
Morning
Afternoon
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Cross Section Surveys
USGS performed 8 cross-sectional surveys of
velocity and turbidity Results similar to
previous surveys, attempting to establish MI
gauge house as representative sampling site
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Return Frequency
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Storm Event Comparison
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Relationship between total Hg and SSC influenced
by salinity
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Salinity Measurements in Dec 05 and Jan 06
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Sediment Load in the Sac River
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Preliminary data
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Max Delaney, SFEI
Seth Shonkoff, SFEI
Jay Davis, SFEI
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Jennifer Hunt, SFEI
Richard Looker, Regional Board
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Thank You!