Fish passage classification of the stream network in the Willamette River Basin, 1990-2020

The U.S. Geological Survey (USGS) Oregon Water Science and Forest and Rangeland Ecosystem Science Centers have developed a spatial database of the stream network in the Willamette River Basin classified by degree of obstruction to fish passage. This effort was funded by the USGS Ecological Flows program in cooperation with the Integrated Water Availability Assessments in the Willamette River Basin. Degree of obstruction along the stream network was characterized by snapping the Oregon Department of Fish and Wildlife (ODFW) fish passage barrier points (Bowers, 2020) to the high-resolution National Hydrography Dataset (NHD) network (USGS, 2022), assigning the passage status of each point to the upstream network, transferring the passage classification to the medium-resolution NHD Plus v2 network (USGS and Environmental Protection Agency, 2020), and manually editing network classifications based on visual review and review of passage and trap-and-haul efforts at 21 dams. The resulting dataset reflects fish passage conditions as of 1990-2020. Following the definitions in the ODFW barriers database, "fish passage" encompasses passage of fish in general, not a specific species. This stream network classification based on fish passage was developed as a dataset for occupancy modeling of native freshwater mussels across the Willamette River Basin. This dataset may also be useful for basin-wide habitat assessments. Users are encouraged to carefully read the documentation to understand the assumptions and limitations of this dataset. Sources in abstract: Bowers, J., 2020, Oregon Fish Passage Barriers, No longer available online. U.S. Geological Survey, 2022, NHDPlus High Resolution: U.S. Geological Survey data release, https://www.usgs.gov/national-hydrography/nhdplus-high-resolution. U.S. Environmental Protection Agency and U.S. Geological Survey, 2020, NHDPlus Version 2.1 Medium Resolution, https://www.epa.gov/waterdata/nhdplus-national-hydrography-dataset-plus.

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  "010:12"
]

[
  "geospatial"
]