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Scientific Investigations Report 2007–5178

U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2007–5178

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Table 11. Percentage of annual total clay-water discharge by subbasin in the North Santiam River basin, Oregon.

[Values represent threshold (fig. 5) that stream water would be persistently turbid, producing clay-water; Little North values for 1999 and 2000 were estimated using discharge as a surrogate for instream turbidity. Abbreviations: T, turbidity; >, greater than; N/A, not available. “dates” prior to instrument installation]

Water
year		 Percentage of annual total clay-water discharge
North Santiam   Breitenbush   French   Blowout   Little North
Turbidity > 64 Turbidity > 89 Turbidity > 170 Turbidity > 76 Turbidity > 69
1999 1.76 4.73 N/A 11.53 8.59
2000 3.37 6.66 N/A 6.55 11.59
2001 .26 .00 N/A .00 .50
2002 1.52 3.02 0.49 9.49 4.02
2003 .78 2.01 .43 .74 4.83
2004 .83 .67 .00 1.23 6.60
Average 1.42 3.42 .31 4.92 6.02

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