Tennessee Valley Authority plans to replace Cherokee Dam aeration system, raising concerns about Striped Bass survival

Tennessee – The Tennessee Valley Authority  has announced its plans to replace the current aeration system at Cherokee Dam with new turbine technology by 2026.

This upgrade aims to improve water quality downstream, but may have unintended consequences for aquatic wildlife, particularly Striped Bass, in Cherokee Reservoir. The Tennessee Wildlife Resources Agency is currently evaluating the potential impacts of these changes.

The existing oxygenation system in Cherokee Reservoir was initially installed to meet TVA’s requirement for minimum dissolved oxygen levels in water released below the dam. While this system was designed for water quality, it has also created a cool, oxygen-rich refuge in the reservoir during the summer months — a crucial survival zone for large Striped Bass.

These fish depend on cooler, well-oxygenated water to survive Tennessee’s hot summers, but natural options for such refuges are limited in the reservoir.

With the planned turbine upgrades, TVA will be able to meet its oxygenation goals downstream without operating the in-reservoir oxygen lines. Consequently, this critical refuge area for Striped Bass will be eliminated, posing a significant risk to their survival.

Experts from TWRA anticipate a higher summer mortality rate among Striped Bass, similar to the event that occurred last year when the oxygen lines were not active during a period of intense heat.

To address these expected changes, TWRA is proactively developing a response plan. As part of this effort, the agency is conducting creel surveys on Cherokee Reservoir to gather feedback from anglers on the potential impacts. TWRA encourages anglers and other stakeholders to share their thoughts, concerns, and questions by reaching out to TWRA_Fisheries@tn.gov.

At this time, no modifications have been made to the Striped Bass or Hybrid Striped Bass stocking programs in Cherokee Reservoir. TWRA remains committed to maintaining open communication with the public and stakeholders as it evaluates the long-term management of the reservoir’s fisheries.