Notification of Beardsley Boat Ramp Closure – 2026

Please be advised that the Beardsley Boat Ramp  is closed to all recreational boating to help prevent the spread of the invasive Golden Mussel.

Beardsley Reservoir will remain closed to recreational boating until further notice. Tri-Dam is actively evaluating options for future access, including potential inspection protocols and coordination with partner agencies. This is an ongoing effort, and updates will be provided as more information becomes available.

We appreciate your patience and cooperation as we work to protect the reservoir. Please continue to check the website regularly for the latest updates.

Golden mussels have not been detected at Beardsley Reservoir. Current prevention measures are in place to protect the reservoir and reduce the risk of introduction.

Golden Mussel Prevention at Beardsley Reservoir

In October 2024, the Golden Mussel (Limnoperna fortunei) was detected for the first time in North America.   This invasive species poses a serious threat to California’s lakes and reservoirs due to its ability to survive in a wide range of water conditions, including varying temperatures and salinity levels.

Why Is the Golden Mussel a Concern?

• Environmental Impact: Golden mussels compete with native and game fish for food and may contribute to harmful algal blooms, which can negatively affect water quality and fish populations.
• Recreational Impact: Invasive mussels can lead to waterbody closures, mandatory inspections, and reduced recreational opportunities.
• Economic Impact: Infestations can cause significant damage to water infrastructure, increase maintenance costs for boats and facilities, and disrupt water delivery systems.

Beardsley Reservoir Status

Beardsley Reservoir has been identified as having water chemistry conditions that could support the potential introduction of invasive mussels, including factors such as calcium levels, pH, and temperature.

In response, and in collaboration with federal and state agencies, the Beardsley boat ramp was closed in 2025 and remains closed as a precautionary measure. This action was taken in partnership with the Stanislaus National Forest and the Federal Energy Regulatory Commission (FERC) license holder, Tri-Dam, which oversees reservoir operations and aquatic invasive species prevention.

Ongoing Prevention Efforts

• Tri-Dam is working closely with agency partners to evaluate long-term strategies for invasive species prevention and determine future access options.
• Educational signage and outreach materials will be installed at Beardsley and other local reservoirs to support public awareness.
• Additional prevention tools, such as voluntary self-inspection stations, may be introduced to aid future re-opening efforts.

For the latest updates on access, inspection protocols, or aquatic invasive species policies, please visit www.tridamproject.com.