Federal Judge Orders Changes to Pacific Northwest Dam Operations to Protect Salmon

A federal judge in Oregon has mandated limited modifications to hydropower dam operations on the Columbia and Snake rivers to protect endangered salmon populations, marking the latest development in a decades-long environmental battle.

U.S. District Judge Michael Simon ruled late Wednesday that the Trump administration’s plans for the dams would further harm salmon runs that are “disappearing from the landscape.” The judge ordered that reservoir levels remain consistent with last year’s operations while implementing specific spill requirements to help migrating salmon navigate the massive structures.

“One of the foundational symbols of the West, a critical recreational, cultural, and economic driver for Western states, and the beating heart and guaranteed resource protected by treaties with several Native American tribes is disappearing from the landscape,” Simon wrote in his decision.

The ruling represents another chapter in protracted litigation involving Oregon, Washington, Native American tribes, and conservation groups seeking stronger protections for salmon. These fish face severe mortality rates as they attempt to navigate the extensive dam system that has transformed the Columbia River Basin.

The legal battle appeared to reach a turning point in 2023 when the Biden administration brokered a landmark agreement, committing $1 billion over ten years for salmon restoration and tribal clean energy projects. That deal paused the ongoing litigation while stakeholders worked toward long-term solutions. However, when the Trump administration later rejected the agreement as “radical environmentalism,” particularly opposing potential breaching of four Snake River dams, plaintiffs returned to court.

In his ruling, Judge Simon expressed frustration with what he called a “disappointing history of government avoidance and manipulation instead of sincere efforts at solving the problem.” His order requires maintaining reservoir levels consistent with last year’s operations while implementing specific spill requirements that he described as “narrowly tailored” to essentially maintain the status quo.

Amanda Goodin, an attorney with environmental law firm Earthjustice, expressed relief at the decision, stating that the government’s proposed operations “would have had really, really devastating consequences for salmon.” Federal agencies, including the Justice Department, National Marine Fisheries Service, and Bonneville Power Administration, have not yet commented on the ruling.

The federal government had argued in court filings that the requested changes would represent a “sweeping scheme to wrest control” of the dams, potentially compromising safety, efficiency, power generation, navigation, and irrigation while potentially raising utility rates.

The Columbia River Basin, covering an area approximately the size of Texas, once supported the world’s most productive salmon ecosystem, with at least 16 stocks of salmon and steelhead. Today, four of those stocks are extinct, and seven are listed as endangered or threatened. The endangered salmon populations are also vital to another iconic but endangered Northwestern species—resident killer whales that depend on the fish as a primary food source.

Dam construction beginning in the 1930s with the Grand Coulee and Bonneville dams provided Depression-era jobs, hydropower, and inland navigation that allowed Lewiston, Idaho, to become the West Coast’s most inland seaport. However, these structures have severely impacted salmon migrations by forcing fish through turbines, creating warmer water temperatures in reservoirs, and dramatically slowing juvenile fish migration to the ocean.

The journey that once took juvenile salmon two to three days from the upper Snake River to the ocean now takes weeks as they navigate eight dams, exposing them to increased predation and other hazards.

The Inland Ports and Navigation Group, which opposed the injunction, expressed concern that the order “increases the risk of harm to infrastructure, listed species, and public safety while failing to demonstrate that there will be benefits to listed salmon and steelhead.”

For regional tribes, however, the dams represent a major threat to salmon, which they consider integral to their cultural and spiritual identity. The specific dams affected by the ruling include Ice Harbor, Lower Monumental, Little Goose and Lower Granite on the Snake River, and Bonneville, The Dalles, John Day and McNary on the Columbia.

As this latest ruling suggests, finding a balance between the region’s hydropower, navigation, and agricultural interests while protecting endangered salmon populations remains an ongoing challenge with profound ecological, cultural, and economic implications for the Pacific Northwest.