Bull Trout Population Assessment in the Columbia River Gorge : Annual Report 2000. Metadata

Metadata describes a digital item, providing (if known) such information as creator, publisher, contents, size, relationship to other resources, and more. Metadata may also contain "preservation" components that help us to maintain the integrity of digital files over time.


  • Main Title Bull Trout Population Assessment in the Columbia River Gorge : Annual Report 2000.


  • Author: Byrne, Jim
    Creator Type: Personal
  • Author: McPeak, Ron
    Creator Type: Personal


  • Sponsor: United States. Department of Energy.
    Contributor Type: Organization
    Contributor Info: US Department of Energy (United States)


  • Name: United States. Bonneville Power Administration.
    Place of Publication: Portland, Oregon
    Additional Info: Bonneville Power Administration, Portland, OR (United States)


  • Creation: 2001-02-01


  • English


  • Content Description: We summarized existing knowledge regarding the known distribution of bull trout (Salvelinus confluentus) across four sub-basins in the Columbia River Gorge in Washington. The Wind River, Little White Salmon River, White Salmon River, and the Klickitat River sub-basins were analyzed. Cold water is essential to the survival, spawning, and rearing of bull trout. We analyzed existing temperature data, installed Onset temperature loggers in the areas of the four sub-basins where data was not available, and determined that mean daily water temperatures were <15 C and appropriate for spawning and rearing of bull trout. We snorkel surveyed more than 74 km (46.25 mi.) of rivers and streams in the four sub-basins (13.8 km at night and 60.2 km during the day) and found that night snorkeling was superior to day snorkeling for locating bull trout. Surveys incorporated the Draft Interim Protocol for Determining Bull Trout Presence (Peterson et al. In Press). However, due to access and safety issues, we were unable to randomly select sample sites nor use block nets as recommended. Additionally, we also implemented the Bull Trout/Dolly Varden sampling methodology described in Bonar et al. (1997). No bull trout were found in the Wind River, Little White Salmon, or White Salmon River sub-basins. We found bull trout in the West Fork Klickitat drainage of the Klickitat River Sub-basin. Bull trout averaged 6.7 fish/100m{sup 2} in Trappers Creek, 2.6 fish/100m{sup 2} on Clearwater Creek, and 0.4 fish/100m{sup 2} in Little Muddy Creek. Bull trout was the only species of salmonid encountered in Trappers Creek and dominated in Clearwater Creek. Little Muddy Creek was the only creek where bull trout and introduced brook trout occurred together. We found bull trout only at night and typically in low flow regimes. A single fish, believed to be a bull trout x brook trout hybrid, was observed in the Little Muddy Creek. Additional surveys are needed in the West Fork Klickitat and mainstem Klickitat to determine the distribution of bull trout throughout the drainage and to determine the extent of hybridization with brook trout.
  • Physical Description: 85 pages


  • Keyword: Trout Bull Trout - Columbia River Watershed - Counting
  • Keyword: Streams
  • Keyword: Columbia River
  • Keyword: Salmon
  • Keyword: Rivers
  • Keyword: Bull Trout - Columbia River Watershed - Counting
  • STI Subject Categories: 54 Environmental Sciences
  • Keyword: Drainage
  • Keyword: Sampling
  • Keyword: Bull Trout - Washington (State) - Counting
  • Keyword: Distribution
  • Keyword: Hybridization
  • Keyword: Rearing
  • Keyword: Safety


  • Other Information: PBD: 1 Feb 2001


  • Name: Office of Scientific & Technical Information Technical Reports
    Code: OSTI


  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Report


  • Text


  • Report No.: DOE/BP-00000651-1
  • Grant Number: 00000651
  • DOI: 10.2172/791688
  • Office of Scientific & Technical Information Report Number: 791688
  • Archival Resource Key: ark:/67531/metadc742137