Biomass and methylmercury concentrations in biweekly biological samples from Brownlee and Oxbow Reservoir outflows, Snake River Hells Canyon Complex (Idaho-Oregon), 2018-2019

This dataset describes biomass and methylmercury concentrations in zooplankton, other invertebrates, fish, and coarse and fine detritus samples collected at the outflow locations of Brownlee and Oxbow Reservoirs in the Snake River Hells Canyon Complex. Based on the sampling locations, the sampled materials were presumed to have flowed through the dam turbines or over the spillway, thereby representing biological export from the reservoirs. Samples were collected biweekly at each location over a sixteen-month period, June 2018 – September 2019. Sampling and analysis methods are described in the Processing Steps section of the metadata.

Data and Resources

Field Value
accessLevel public
bureauCode {010:12}
catalog_@context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
catalog_conformsTo https://project-open-data.cio.gov/v1.1/schema
catalog_describedBy https://project-open-data.cio.gov/v1.1/schema/catalog.json
identifier USGS:625708ded34e21f827701dfe
metadata_type geospatial
modified 20220527
old-spatial -116.9591, 44.8189, -116.7943, 45.0046
publisher U.S. Geological Survey
publisher_hierarchy Department of the Interior > U.S. Geological Survey
resource-type Dataset
source_datajson_identifier true
source_hash 6e03d394bcf999d51328eafadc7315b126fc8df8
source_schema_version 1.1
spatial {"type": "Polygon", "coordinates": [[[-116.9591, 44.8189], [-116.9591, 45.0046], [ -116.7943, 45.0046], [ -116.7943, 44.8189], [-116.9591, 44.8189]]]}
theme {geospatial}
Groups
  • AmeriGEOSS
  • National Provider
  • North America
Tags
  • amerigeo
  • amerigeoss
  • bioaccumulation
  • biota
  • ckan
  • contamination-and-pollution
  • ecotoxicology
  • environment
  • field-sampling
  • fish
  • geo
  • geoss
  • hells-canyon
  • ictaluridae
  • idaho
  • inlandwaters
  • invertebrates
  • lepomis-macrochirus
  • mercury-contamination
  • methylmercury
  • micropterus-dolomieu
  • national
  • north-america
  • oregon
  • perca-flavescens
  • plankton
  • pomoxis
  • snake-river
  • toxic-trace-element-contamination
  • united-states
  • usgs-625708ded34e21f827701dfe
isopen False
license_id notspecified
license_title License not specified
maintainer Austin K Baldwin
maintainer_email akbaldwi@usgs.gov
metadata_created 2025-11-21T08:53:57.465105
metadata_modified 2025-11-21T08:53:57.465109
notes This dataset describes biomass and methylmercury concentrations in zooplankton, other invertebrates, fish, and coarse and fine detritus samples collected at the outflow locations of Brownlee and Oxbow Reservoirs in the Snake River Hells Canyon Complex. Based on the sampling locations, the sampled materials were presumed to have flowed through the dam turbines or over the spillway, thereby representing biological export from the reservoirs. Samples were collected biweekly at each location over a sixteen-month period, June 2018 – September 2019. Sampling and analysis methods are described in the Processing Steps section of the metadata.
num_resources 2
num_tags 31
title Biomass and methylmercury concentrations in biweekly biological samples from Brownlee and Oxbow Reservoir outflows, Snake River Hells Canyon Complex (Idaho-Oregon), 2018-2019