{"accessLevel": "public", "bureauCode": ["010:12"], "contactPoint": {"@type": "vcard:Contact", "fn": "James S. White", "hasEmail": "mailto:gs-w-or_sciencebase@usgs.gov"}, "description": "The size and distribution of riverbed grain size plays a foundational role in river morphology and ecology. This study (White and others, 2025) quantifies submerged riverbed grain size at high resolution (1 square meter) across 260 kilometers of geomorphically diverse river corridors in the Santiam River Basin, Oregon, by pairing bathymetric lidar point-clouds collected in 2023 with georeferenced pebble counts. \nThis data release documents the grain size model results of the study, including the median grain size (\u201cD50\u201d) and 84th percentile (\u201cD84\u201d) results for each of the seven study reaches, including the North Santiam River below Big Cliff Dam (\u201clower North Santiam\u201d), the Little North Santiam River, Breitenbush River, North Santiam River above Detroit Reservoir (\u201cupper North Santiam\u201d), the South Santiam River below Foster Dam (\u201clower South Santiam\u201d), Quartzville Creek, the Middle Santiam River, and the South Santiam River above Foster Reservoir (\u201cupper South Santiam\u201d). This metadata provides an overview of the data, but users are encouraged to read the associated study for details on model development and limitations (White and others, 2025). Notably, published datasets are limited to areas where bathymetric lidar returns were at least 5 points per square meter, and areas not achieving this point density were removed.\nCitation and link for associated journal article: White, J. S., Bartelt, K., Overstreet, B. T., & Kelley, J. R. (2025). High resolution mapping of submerged sediment size and suitable salmon spawning habitat using topo\u2010bathymetric Lidar in the Santiam River basin, Oregon. Water Resources Research, 61, e2024WR039219.\nhttps://doi.org/10.1029/2024WR039219", "distribution": [{"@type": "dcat:Distribution", "accessURL": "https://doi.org/10.5066/P13SQVZY", "description": "Landing page for access to the data", "format": "XML", "mediaType": "application/http", "title": "Digital Data"}, {"@type": "dcat:Distribution", "description": "The metadata original format", "downloadURL": "https://data.usgs.gov/datacatalog/metadata/USGS.67119696d34e8fed37af0e98.xml", "format": "XML", "mediaType": "text/xml", "title": "Original Metadata"}], "identifier": "http://datainventory.doi.gov/id/dataset/USGS_67119696d34e8fed37af0e98", "keyword": ["Breitenbush River", "IWS", "Integrated Water Science", "Middle Santiam River", "NGWOS", "Next Generation Water Observing System", "North Santiam River", "Oregon", "Quartzville Creek", "Santiam River Basin", "South Santiam River", "USGS:67119696d34e8fed37af0e98", "Willamette River Basin", "environment", "geoscientificInformation", "grain-size analysis", "inlandWaters", "lidar", "remote sensing"], "modified": "2025-07-10T00:00:00Z", "publisher": {"@type": "org:Organization", "name": "U.S. Geological Survey"}, "spatial": "-123.1487, 44.3911, -121.8828, 44.8331", "theme": ["geospatial"], "title": "Submerged Grain Size Maps in the Santiam River Basin, Oregon"}