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Scientific Investigations Report 2010–5038

Prepared in cooperation with the City of Salem

Suspended-Sediment Budget for the North Santiam River Basin, Oregon, Water Years 2005–08

By Heather M. Bragg and Mark A. Uhrich

Thumbnail of and link to report PDF (1.8 MB)Significant Findings

An analysis of sediment transport in the North Santiam River basin during water years 2005–08 indicated that:

  • Two-thirds of sediment input to Detroit Lake originated in the upper North Santiam River subbasin.
  • Two-thirds of the sediment transported past Geren Island originated in the Little North Santiam River subbasin.
  • The highest annual suspended-sediment load at any of the monitoring stations was the result of a debris flow on November 6, 2006, on Mount Jefferson.
  • About 86 percent of the total sediment input to Detroit Lake was trapped in the lake, whereas 14 percent was transported farther downstream.
  • More than 80 percent of the sediment transport in the basin was in November, December, and January.
  • The variance in the annual suspended-sediment loads was better explained by the magnitude of the annual peak streamflow than by the annual mean streamflow.

For additional information contact:
Oregon Water Science Center Director,
U.S. Geological Survey,
2130 SW 5th Avenue
Portland, Oregon 97201

Part or all of this report is presented in Portable Document Format (PDF); the latest version of Adobe Reader or similar software is required to view it. Download the latest version of Adobe Reader, free of charge.

Suggested citation:

Bragg, H.M., and Uhrich, M.A., 2010, Suspended-sediment budget for the North Santiam River basin, Oregon, water years 2005–08: U.S. Geological Survey Scientific Investigations Report 2010–5038, 26 p.

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