Monitoring of migrating juvenile salmonids is conducted at Lower Granite (LGR), Little Goose (LGS), Lower Monumental (LMN), McNary (MCN), Rock Island (RIS), and Bonneville (BON) dams. The goal of the juvenile salmonid examinations is to determine the relative extent to which the migrating juvenile salmonids passing the dam or sampling location have been exposed to harmful levels of total dissolved gas based upon the prevalence and severity of GBT-induced bubbles on the fish. Click here for the GBT Metadata.
GBT Queries & Reports Daily Smolt Reports
Schedule, Manuals, Metadata, & Program Manuals, Metadata, & Program
  • GBT metadata GBT metadata
  • Gas Bubble Trauma Monitoring Protocol Gas Bubble Trauma Monitoring Protocol
  • Gas Bubble Trauma Data Entry Program Gas Bubble Trauma Data Entry Program (self extracting executable)
  • Current Year GBT Monitoring Schedule

    Site Times Per Week Begin Date End Date
    Bonneville Dam Twice April 15 August 31
    Little Goose Once April 15 August 31
    Lower Monumental Once April 15 August 31
    Lower Granite Once April 15 June 30
    McNary Dam Twice April 15 August 31
    Rock Island Dam Twice April 15 August 31




Page design last updated on: April 15, 2019
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