For much of the twentieth century, the San Joaquin River was defined by absence. Once home to thriving salmon runs, the river gradually lost its ability to support the species after the construction of Friant Dam and the diversion of water for agricultural use. According to Sharon Weaver, Executive Director of the San Joaquin River Parkway and Conservation Trust, the disappearance of salmon was not a sudden event but the result of structural changes that altered the river’s natural flow over time.
Parkway operates as a nonprofit land trust focused on acquiring, restoring, and managing land along a stretch of the river. Its work intersects with broader regional efforts aimed at ecological restoration, including initiatives designed to bring salmon back to the river. From Weaver’s perspective, the return of salmon represents more than a single environmental milestone. “It’s a signal that long-term, coordinated efforts can begin to reverse changes that once seemed permanent,” she explains.
Historically, salmon relied on a connected river system that allowed them to move between freshwater and the ocean. Weaver notes that this lifecycle was disrupted when water diversions reduced the river’s flow to the point where it no longer consistently connected to downstream systems. Over time, that disruption led to the disappearance of salmon from the river. “They need a continuous pathway to complete their lifecycle, and for many years, that pathway simply didn’t exist,” she says.
Efforts to restore that connection have unfolded over decades and involve a collaboration between state and federal agencies, farmers, and conservation organizations. According to Weaver, one of the key strategies has been the use of targeted water releases, often referred to as pulse flows, which are timed to align with salmon migration periods. “These releases help reconnect segments of the river at critical moments, allowing fish to move upstream and downstream,” Weaver says.
The results of these efforts are beginning to emerge. Weaver points to recent observations showing a significant number of returning adult salmon, bringing the river closer to levels associated with a self-sustaining population. “Seeing that number approach the threshold needed for sustainability shows that the system is starting to respond,” she explains. While the process is ongoing, these returns are viewed as an important indicator that restoration strategies are having a measurable impact.
Beyond water management, restoration has also focused on improving habitat conditions along the river. Weaver emphasizes that floodplains and vegetation play a critical role in supporting salmon survival, particularly during early life stages. According to her, these areas provide nutrient-rich environments where juvenile fish can grow before making their journey downstream. “When you restore floodplains and plant trees along the river, you are improving the landscape and creating the conditions that allow species to thrive,” she says.
Temperature is another key factor. Weaver notes that in a region known for its heat, maintaining cooler water conditions is essential for salmon survival. She explains that tree canopy along the river helps regulate temperature by providing shade, reinforcing the importance of long-term habitat restoration as part of the broader effort. From her perspective, these elements work together to create a system that supports both ecological balance and resilience.
Innovation has also played a role in accelerating progress. Weaver highlights the development of the Salmon Conservation and Research Facility (SCARF), designed to support breeding and improve survival rates. She notes that the facility represents an evolution in how restoration is approached, combining scientific research with practical implementation. “Apart from bringing salmon back, it’s about creating the conditions where they can sustain themselves over time,” she explains.
The return of salmon also reinforces the broader purpose of the San Joaquin River Parkway. As land is preserved and restored, the benefits extend beyond individual species to the overall health of the ecosystem. Weaver suggests that this interconnected approach is central to the Parkway’s work, where environmental restoration and public access are viewed as complementary rather than separate goals.
At the same time, she frames the current moment as both encouraging and instructive. While progress is visible, it also highlights the importance of maintaining momentum and protecting the conditions that have made recovery possible. From her perspective, the return of salmon demonstrates what can be achieved when long-term vision is paired with sustained effort.
“There was a time when people questioned whether salmon could ever come back to this river,” Weaver says. “Now we are seeing that recovery is possible, and that changes how we think about what’s achievable moving forward.”
As restoration efforts continue, the story of the San Joaquin River is gradually shifting from one of loss to one of renewal. The return of salmon serves as both evidence of progress and a reminder of the work that remains. For Weaver, it also represents something more enduring. She says, “It shows that when you invest in a river and the surrounding landscape, you are investing in a future that benefits both people and the environment.”
