Four dams in the Klamath River Hydroelectric Project (KHP) in Oregon and California (Figure 1) are currently scheduled to be removed over a period of a few weeks or months, beginning in January 2021. The Klamath dam removal will be the largest in the world by almost all measures, and is an unprecedented opportunity to advance science of river responses to such events. The KHP contains approximately 10-12 million cubic meters of mostly fine sediment and model estimates suggest approximately 1/3-2/3 of this volume is expected to be eroded from reservoirs. Much of this sediment is expected to be eventually transported by the river to, or through, the Klamath River Estuary, a distance of more than 300 kilometers. To improve the success of restoration activities following dam removal, agencies must understand the baseline conditions for biological, chemical, and physical processes, prior to the removal. We expect large changes in water quality (turbidity, suspended sediment, dissolved oxygen, temperature, and algal toxins) and in fish habitat in the Hydroelectric Reach and the main-stem of the Klamath River to the ocean. For example, modeled sediment concentrations in the Klamath River during dam removal were estimated exceed 10,000 – 15,000 mg/L, depending on streamflows, location, and the dam removal process, and to remain > 100 – 1000 mg/L for months at a time. Final time to achieve background concentrations post dam removal may take over two years (Reclamation, 2011). Plans to assess many of these changes post-dam removal are still being formulated.
Citation Information
| Publication Year | 2019 |
|---|---|
| Title | Refining the Baseline Sediment Budget for the Klamath River, California |
| Authors | Chauncey W. Anderson, Scott A. Wright, Liam N. Schenk, Katherine Skalak, Jennifer A. Curtis, Amy E. East, Adam Benthem |
| Publication Type | Conference Paper |
| Publication Subtype | Conference Paper |
| Index ID | 70212624 |
| Record Source | USGS Publications Warehouse |
| USGS Organization | California Water Science Center; New England Water Science Center; Oregon Water Science Center; Pacific Coastal and Marine Science Center |
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Chauncey Anderson
Hydrologist, Water-Quality Specialist
Scott A Wright
Program Chief, Watersheds, Ecology, and Integrated Hydrologic Modeling (Acting)
Katherine Skalak
Integrated Water Prediction Program Manager (acting)
Amy East
Research Geologist
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Chauncey Anderson
Hydrologist, Water-Quality SpecialistEmailPhoneScott A Wright
Program Chief, Watersheds, Ecology, and Integrated Hydrologic Modeling (Acting)EmailPhoneKatherine Skalak
Integrated Water Prediction Program Manager (acting)EmailPhoneAmy East
Research GeologistEmailPhone