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Clark Canyon Reservoir has been releasing waters with elevated levels of turbidity into the downstream Beaverhead River. This study was initiated in cooperation with the State of Montana to study why these turbidity episodes occur. Daily reservoir profile data attached as separate files for this project, in addition to data owned by the State of Montana, were used to help describe in reservoir conditions, and were used in concert with ADCP data (supplemental report and appendix) and the development of a CE-QUAL model to help describe reservoir processes leading up to downstream turbidity events. Results indicate episodes are likely seasonal events and not the result of a sediment layer that has built up over time. Turbidity episodes most commonly occur under lower reservoir conditions when stratification is not strong and when wind events out of the North occur.", "catalogStatusId":1, "metadataFilePath":null, "metadataStandard":{ "_id":"ISO", "definition":"International Standards Organization (ISO) 19115-1:2014 metadata content standard, and ISO 19139:2007 metadata implementation standard", "createDate":"2018-11-20T13:25:52+00:00" }, "createDate":"2021-08-27T19:40:13+00:00", "updateDate":"2025-12-10T16:49:40+00:00", "programNames":[ "Science and Technology Program" ], "generationEffort":"S&T Project 19080: Aging Reservoirs, Climate, Operations, and Potential Cumulative Impacts to Water Quality, Clarity and Fisheries and Recreation", "generationEffortId":84, "subTheme":{ "_id":3, "subTheme":"Water Quality Monitoring", "definition":"Relating to the monitoring of the chemical, physical, biological, and radiological characteristics of water", "createDate":"2018-11-14T14:34:42+00:00" }, "tags":[ "Turbidity", "Water Quality" ], "themes":[ "Water Quality" ] }, "type":"CatalogRecord", "relationships":{ "location":{ "data":[ { "id":"/rise/api/location/294", "type":"Location" } ] }, "catalogItems":{ "data":[ { "id":"/rise/api/catalog-item/11010", "type":"CatalogItem" }, { "id":"/rise/api/catalog-item/11011", "type":"CatalogItem" }, { "id":"/rise/api/catalog-item/11478", "type":"CatalogItem" }, { "id":"/rise/api/catalog-item/11480", "type":"CatalogItem" }, { "id":"/rise/api/catalog-item/11481", "type":"CatalogItem" } ] } } }, { "id":"/rise/api/catalog-item/11010", "attributes":{ "_id":11010, "itemTitle":"S&T Project 19080 Supplemental Report: Clark Canyon Water Quality Model ENV-2020-062", "itemDescription":"CE_QUAL W2 modelling report on Clark Canyon Reservoir from S&T Project 19080. Clark Canyon Reservoir (CCR) is in southwest Montana and managed by the Missouri Basin Region\u2019s Montana Area Office. It is constructed at the head of the Beaverhead River, linking its outflow water quality with the river\u2019s. Over the past few years, tailwater releases have resulted in high turbidity levels in Beaverhead River during the late summer and early fall months. This has led to an effort to better understand the transport of sediment out of the reservoir. This report describes the Clark Canyon Reservoir water quality model which was developed to better understand the turbidity dynamics within the reservoir. Section 2 describes the project\u2019s background and overall goals. Section 3 provides a description of the study area along with a conceptual understanding of the water quality dynamics within Clark Canyon Reservoir. Section 4 discusses the development of the water quality model including model rates, settings and calibration. Section 5 provides the calibration modeling results. Section 6 looks at the model\u2019s sensitivity to reservoir water levels and outlet height. Section 7 describes how particle simulations were used to investigate sediment transport in the reservoir and how sediment transport is also impacted by reservoir water levels and outlet height. 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An acoustic Doppler profiler (ADP) was deployed near the outlet works intake structure to gain an understanding of surface currents and outlet works withdrawal zone hydraulics during periods of thermal stratification for 2017 and 2018. The ADP data sets will provide information to develop an understanding of the transport of turbidity plumes to the reservoir outlet along with evaluating strong wind events on measured reservoir current profiles. 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Reclamation personnel collected data and developed and used the CE-QUAL W2 model. Reservoir elevations combined with wind events resulted in increases in down stream turbidity during times reservoir elevations and temperature conditions allowed mixing and the development of a single large circulation cell. Changing potential release elevations were studied at the request of some user groups, and CE-QUAL is one way to simulate operational scenarios. Changing release levels may impact downstream turbidity with shallower releases initially resulting in lower downstream turbidity until reservoir turnover occurs. Included with the report are two supplemental reports which are also attached as appendices to the final report. These reports detail analysis of Acoustic Doppler (ADCP) data, and the results of the CE-QUAL modelling study. Water quality profile datasets are also included for years 2017 and 2018, and include daily profile data for Dissolved Oxygen, Specific Conductance, Temperature, Turbidity and pH. 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