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Two-dimensional HEC-RAS models for the North Santiam River, Oregon, 2026

Published by U.S. Geological Survey | Department of the Interior | Catalog Last Checked: August 01, 2026 at 04:12 AM | Dataset Last Updated: July 20, 2026 at 12:00 AM
This data release contains two-dimensional hydraulic models for the North Santiam River, extending from Big Cliff Dam downstream to the confluence with the South Santiam River using underlying bathymetry from White and others (2026). The model extent is separated into four individual reach-scale models for boundary condition simplification and run-time efficiency. The attached shapefile “NorthSantiam_habitat_reaches.shp” delineates the spatial extent that hydraulic model results were clipped to for fish habitat modeling. These models were developed to assess general patterns of fish habitat at streamflows ranging from typical low summer flows (less than or equal to the 1st percentile of mean daily streamflows) to approximately the median annual high flow (approximately the 95th percentile of mean daily streamflows) for each reach. Nearly steady-state streamflow conditions were simulated by holding streamflow constant for extended periods of time. Information about model development, calibration, and results can be found in White and Wallick (2022) and White and others (2026).

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