Karen M. Bartelt Laurel E. Stratton Garvin Stewart A. Rounds 20240826 tabular digital data https://doi.org/10.5066/P14ASESQ This data release consists of a two-dimensional (laterally averaged) hydrodynamic water-quality model (CE-QUAL-W2; Wells, 2019) of Green Peter and Foster Lakes for the 2023 calendar year, and three theoretical deep drawdown operational scenarios that apply the 2023 model to calendar year 2024. The model and scenarios were used to gain insights into the thermal processes in Green Peter and Foster Lakes and downstream water release temperatures from Green Peter Dam to the Middle Santiam River and from Foster Lake to the South Santiam River during deep drawdown operations, and to investigate the effects of deep reservoir drawdown timing on water temperatures within and downstream of Green Peter and Foster Lakes. The model and scenarios documented here were modified from the Green Peter and Foster Lakes model documented in Stratton Garvin and Rounds (2023) and Stratton Garvin and others (2023), and are not appropriate for use other than the intended purpose of comparing various drawdown operational scenarios using 2023 deep drawdown conditions to inform potential management decisions. This data release documents the 2023 Green Peter and Foster CE-QUAL-W2 reservoir model and three drawdown operational scenarios in the South Santiam watershed. This model was updated for 2023 conditions and then applied to theoretical drawdown scenarios with the purpose of investigating the effects of deep reservoir drawdown timing on water temperatures within and downstream of Green Peter and Foster Lakes. 20230101 20241231 ground condition Complete None planned Green Peter Foster Lakes Model Domain -122.56 -122.38 44.524 44.432 ISO 19115 Topic Category climatologyMeteorologyAtmosphere inlandWaters USGS Thesaurus surface water quality modeling water temperature hydrology none water temperature modeling CE-QUAL-W2 reservoirs deep reservoir drawdown USGS Metadata Identifier USGS:6668ce98d34e9bcc607b8fa5 Geographic Names Information System Oregon Willamette Valley Middle Santiam River South Santiam River Quartzville Creek Foster Dam Foster Lake Green Peter Dam Green Peter Lake None. Please see 'Distribution Info' for details. Users are advised to read the dataset's metadata and readme files thoroughly to understand appropriate use and data limitations. The USGS shall not be held liable for improper or incorrect use of the data retrieved from the system. The USGS should be acknowledged as the data source in derived products. The original model (Stratton Garvin and others, 2023) was calibrated and described within its associated documentation. The model associated with this data release was modified and is no longer deemed to be fully calibrated, but has been tailored to the deep drawdown conditions of 2023. This model is not appropriate for use other than its intended purpose of comparing various operational scenarios using 2023 deep-drawdown conditions to inform potential management decisions. Karen Bartelt U.S. Geological Survey, NW-PACIFIC ISLAND REG Hydrologist mailing address

601 SW 2nd Ave, Suite 1950

Portland OR 97204 United States 541-214-1365 gs-w-or_sciencebase@usgs.gov The 2023 modeled water-temperature outputs were compared to measured water temperature data (U.S. Geological Survey, 2023) to assess the overall reliability of simulated temperature results. See the “Model Fit” section of the README_GreenPeter_and_Foster_W2.txt file for additional information. Modeled water temperature outputs for the 2023 model and three hypothetical/theoretical 2024 scenarios were reviewed by team members to ensure outputs were logically consistent. No formal logical accuracy tests were conducted. Data set is considered complete for the information presented, as described in the abstract. Users should fully read metadata and README document prior to using this model or model results. This model should not be used other than intended purpose of comparing differing drawdown operational scenarios to inform management decisions. A formal accuracy assessment of the horizontal positional information in the dataset has not been conducted, No formal positional accuracy tests were conducted. Elevations of infrastructure and bathymetry reference the National Geodetic Vertical Datum of 1929. Laurel E. Stratton Garvin Stewart A. Rounds 2023 digital data U.S. Geological Survey Data Release online U.S. Geological Survey https://doi.org/10.5066/P9UJFXA5 online 2023 publication date Stratton Garvin and Rounds, 2023 Data release for U.S. Geological Survey updates to the CE-QUAL-W2 model code. Data release includes the model and documentation prior to updates made for this data release. Laurel E. Stratton Garvin Norman L. Buccola Stewart A. Rounds 2023 Publication U.S. Geological Survey Scientific Investigations Report 2023–5085 online U.S. Geological Survey 85 p. https://doi.org/ 10.3133/sir20235085 Digital 2023 publication date Stratton Garvin and others, 2023 Report describing original model and description of the model, data, and techniques used in modeling applications. Report includes model documentation prior to updates made for this data release U.S. Geological Survey 2024 U.S. Geological Survey web interface online U.S. Geological Survey https://waterdata.usgs.gov/nwis online 2024 publication date U.S. Geological Survey, 2024 The report describes detailed methods for water-temperature monitoring and review. Scott A. Wells 2019 publication http://www.cee.pdx.edu/w2/ Hardcopy 2012 publication date Wells, 2019 Report providing technical details for CE-QUAL-W2 version 4.2. Western Regional Climate Center 2024 online Desert Reasearch Insitute https://raws.dri.edu/cgi-bin/rawMAIN.pl?orOJOR online 2024 publication date Western Region Climate Center, 2024 Data source for wind speed and direction time series used in this model. 1. An existing CE–QUAL–W2 model described in previous publications (Stratton Garvin and Rounds (2023) and Stratton Garvin and others (2023), which was modified from Wells (2019)) was used as the basis for the model updates for Green Peter and Foster Lakes included in this data release. 2023 2. The model described in Stratton Garvin and Rounds (2023) and Stratton Garvin and others (2023) was updated as follows: a. Model boundary conditions were updated to represent the 2023 calendar year. b. Model performance was checked and various parameters adjusted, as necessary, because the data source used by Stratton Garvin and others (2023) was no longer available or to improve model stability or improve model fit to better simulate the 2023 thermal conditions that were observed in the reservoir and downstream. This included updates to wind speed and direction time series data, light extinction coefficients, outlet source type and line width, precipitation, and Middle Santiam inflows. Updates made for this data release are described in README_GreenPeter_and_Foster_W2.txt. Users should fully read metadata and README documents prior to using this model or model results. 2024 3) The adjusted 2023 model was run for three different operational scenarios based on a combination of measured data and HEC-ResSim model outputs provided by the U.S. Army Corps of Engineers. More details are provided in Scenarios section of the README file associated with this data release. 2024 0.01 0.01 Decimal degrees National Geodetic Vertical Datum of 1929 1.0 feet Attribute values GreenPeter_and_Foster_CE_QUAL_W2.zip The compressed file “GreenPeter_and_Foster_CE_QUAL_W2.zip” contains the complete archive for the 2023 Green Peter Foster Lakes CE-QUAL-W2 model. See README_GreenPeter_and_Foster_W2.txt for a description of the contents including: documentation, background information, model adjustments, model fit, model construction and calibration, model scenarios, directory structure including descriptions of file contents, CE-QUAL-W2 information and use instructions, and references. The zipped folder contains subfolders with 1) CE-QUAL-W2 executable, 2) model calibration data, 3) the model, 4) an additional copy of the readme file, 5) model scenarios, and scenario calibration data. Producer defined README_GreenPeter_and_Foster_W2.txt Documentation the describes model background information, model adjustments, model fit, directory structure, information about CE-QUAL-W2 and how to use it, model construction and calibration, and references. Producer defined U.S. Geological Survey GS ScienceBase mailing address

Denver Federal Center, Building 810, Mail Stop 302

Denver CO 80225 United States 1-888-275-8747 sciencebase@usgs.gov This model and data have been approved for release by the U.S. Geological Survey (USGS). Although the data have been subjected to review and are substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, the data are released on the condition that neither the USGS nor the U.S. Government shall be held liable for any damages resulting from authorized or unauthorized use. Although the data, software, and related material have been processed successfully on a computer system at the USGS, no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. The USGS or the U.S. Government shall not be held liable for improper or incorrect use of the data described and/or contained herein. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. This model should not be used other than for its intended purpose of comparing differing drawdown operational scenarios to inform management decisions. Digital Data https://doi.org/10.5066/P14ASESQ None 20240826 Karen Bartelt U.S. Geological Survey, NW-PACIFIC ISLAND REG Hydrologist mailing address

601 SW 2nd Ave, Suite 1950

Portland OR 97204 United States 541-214-1365 gs-w-or_sciencebase@usgs.gov FGDC Biological Data Profile of the Content Standard for Digital Geospatial Metadata FGDC-STD-001.1-1999