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Research Reports

Impacts of Channel Reconstruction in the Pilchuck River


A five-year study was performed to compare conditions in the Pilchuck River before and after channel reconstruction associated with rerouting highway SR-2. The study focused on sediment particle-size analyses, benthic macro-invertebrates and fish. Substrates comparable to control areas developed in all portions of the new channel within one year after construction. The available data on invertebrates and fish gave no indication of deterioration in diversity, quantity or size in the reconstructed channel. The report provides recommendations for further improvements in the design of stream channel changes should there be no alternative to their construction.


  • Date Published: September, 1982
  • Publication Number: WA-RD 39.15
  • Last Modified: August 5, 2007
  • Authors: Richard R. Horner, Eugene B. Welch.
  • Originator: University of Washington. Environmental Engineering and Science Program.
  • # of Pages: 41 p., 630 KB (PDF)
  • Subject: Benthos, Biodiversity, Channels (Waterways), Design, Environmental impacts, Environmental quality, Fishes, Grain size (Geology), Recommendations, Rivers, Sediments, Stream restoration, Streambeds, Substrates (Waterways)
  • Keywords: Rivers, channel reconstruction, sediments, benthic macro-invertebrates, fish, impacts, Pilchuck River, SR 2.
  • Related Publications: Water Quality Impacts Associated with Leachates from Highway Woodwastes Embankments, (WA-RD 39.1).
    Effects of Velocity and Nutrient Alterations on Stream Primary Producers and Associated Organisms, (WA-RD 39.2).
    Highway Runoff Monitoring: The Initial Year, (WA-RD 39.3).
    Composite Sampling of Highway Runoff: Year 2, (WA-RD 39.4).
    Criteria and Requirements for Statewide Highway Runoff Monitoring Sites, (WA-RD 39.5).
    Characterization of Highway Runoff in Washington State, (WA-RD 39.6).
    Year 3 - Runoff Water Quality, August 1979 - August 1980, (WA-RD 39.7).
    Views of Risk and Highway Transportation of Hazardous Materials - A Case Study in Gasoline, (WA-RD 39.8).
    A Survey of Trace Organics in Highway Runoff in Seattle, Washington, (WA-RD 39.9).
    Transport Deposition and Control of Heavy Metals in Highway Runoff, (WA-RD 39.10).
    Effects of Seattle Area Highway Stormwater Runoff on Aquatic Biota, (WA-RD 39.11).
    Highway Runoff in Washington State: Model Validation and Statistical Analysis, (WA-RD 39.12).
    Assessment of Pollutant Loadings and Concentrations in Highway Stormwater, (WA-RD 39.12.1).
    Year 4, Runoff Water Quality, August 1980-August 1981, (WA-RD 39.13).
    Guide for Water Quality Impact Assessment of Highway Operations and Maintenance, (WA-RD 39.14).
    Summary -- Highway Runoff Water Quality Study, 1977-1982, (WA-RD 39.16).

This abstract was last modified April 29, 2008