Cumulative effects of logging road sediment on salmonid populations in the Clearwater River, Jefferson County, Washington

C. J. Cederholm; L. M. Reid; E. O. Salo

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Cumulative effects of logging road sediment on salmonid populations in the Clearwater River, Jefferson County, Washington

Informally Refereed

Authors:

C. J. Cederholm, L. M. Reid, E. O. Salo

Year:

1981

Type:

Miscellaneous Publication

Station:

Pacific Southwest Research Station

Source:

Presented to the conference Salmon-Spawning Gravel: A Renewable Resource in the Pacific Northwest? 6-7 October 1980 Seattle Washington. 35 p.

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Abstract

Abstract - The nature of sediment production from logging roads and the effect of the resulting sediment on salmonid spawning success in the Clearwater River drainage have been studied for eight years. The study includes intensive and extensive analyses of field situations, supplemented by several controlled experiments. It was found that significant amounts (15-25 percent) of fine sediments (less than 0.85 mm diameter material) are accumulaing in spawning gravels of some heavily roaded tributary basins. This accumulation is highest in basins where the road area exceeds 2.5 percent of the basin area.

Keywords

PSW4351, salmonid, erosion, landslides, logging

Citation

Cederholm, C. J.; Reid, L. M.; Salo, E. O. 1981. Cumulative effects of logging road sediment on salmonid populations in the Clearwater River, Jefferson County, Washington. Presented to the conference Salmon-Spawning Gravel: A Renewable Resource in the Pacific Northwest? 6-7 October 1980 Seattle Washington. 35 p.