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SOS Blog

Save Our Wild Salmon

Hot Water Report 1


Welcome to Save Our wild Salmon’s Hot Water Report 2020, Week 4. This weekly report presents conditions on the lower Snake and Columbia rivers - like water temperatures, status of salmon and steelhead returns and related topics - via graphs, analyses, and stories. The harmful effects on struggling native fish populations caused by federal dams and their reservoirs is now being exacerbated each year due to warming waters and a changing climate.

We’ll hear from scientists, fishers, guides, and salmon and river advocates about the status of returning adult salmon and steelhead and the challenges facing their rivers. We'll also explore opportunities to improve their health and begin to rebuild abundant, resilient populations and the many benefits they deliver to Northwest culture, economy and ecology.

Abundant Snake and Columbia River salmon and steelhead populations have historically delivered irreplaceable cultural, economic, nutritional and ecological benefits to the people and fish and wildlife of the Pacific Northwest. Today, however, these fish are in crisis - thirteen populations in the Basin face extinction - putting jobs and communities and other wildlife populations at risk as well. The region’s critically endangered Southern Resident orca, for example, depend mainly on chinook salmon for their diet. As these populations have decreased in Northwest coastal waters - and especially Snake River spring chinook - the Southern Residents population has dwindled. Just 72 individual whales remain today.

Will you be on the river this summer? Do you have a story or photo you would like to share? Please send them to Oakley Wurzweiler

The Hot Water Report is a joint project of the Save Our wild Salmon Coalition, Washington Sierra Club, Columbia Riverkeeper, Idaho Rivers United, Idaho Wildlife Federation, Snake River Waterkeeper, Northwest Steelheaders, Orca Conservancy, Idaho Conservation League, Defenders of Wildlife, Pacific Rivers, the Natural Resources Defense Council, American Rivers, and Friends of the Clearwater.

II. READING THE DATA (through August 4)

LSR graph 852020

The daily mean temperature at the forebay (upstream reservoir) of each dam is represented in the solid lines and the 10 year average (2010-2020) for each reservoir is represented by the dashed line of the same color. The dotted line across the top of the graph represents the 68°F survival threshold for salmon and steelhead. These fish begin to suffer harmful effects when water temperatures exceed 68° Fahrenheit. The longer temperatures remain above 68°F and the higher the temperatures rise above 68°F, the more severe these effects, including: increased metabolism (energy expenditure), increased susceptibility to disease, reduced fecundity or reproductive potential, and/or death.

Once again this week, temperatures in three of the four lower Snake River reservoirs remain above 68°F. The temperatures in the reservoir created by Ice Harbor Dam have recently been below the 10-year average for this time of year but as the week progressed, the temperatures now exceed the 10-year average. The water temperatures behind Little Goose and Lower Granite Dams continue to exceed the 10-year average for this time of year. Temperatures in the waters behind Lower Granite Dam this week are hovering just below 68°F.

A note on Lower Granite Dam’s reservoir: Temperatures in the Lower Granite reservoir in the summer months are typically cooler than the three downstream reservoirs on the lower Snake due to an influx of cold water originating in the Dworshak reservoir, which is located on the North Fork Clearwater River on the Nez Perce Reservation. Each summer, Dworshak Dam is drawn down 80 feet for temperature control and flow augmentation to help juvenile salmon survive their journey to the ocean. While this operation is beneficial for cooling the lower Snake, it does negatively impact recreation in the reservoir, and in the Clearwater River, which is too cold for area residents to swim in. The cold water mixes in Lower Granite reservoir and its benefits for fish dissipate here before the waters flow further downstream. EPA models show that a freely flowing lower Snake would carry these cooler waters (and their benefits for salmon and steelhead) all the way downstream to its confluence with the Columbia River near the Tri-Cities (WA).

LCR graph 852020

All four lower Columbia River reservoirs continue to exceed 68°F by up to three degrees. All the reservoirs’ water temperatures currently exceed the 10-year average for this time of year. Based on past summers, we expect these four reservoirs to remain above 68°F for the next few weeks. The issue of hot reservoirs in the lower Columbia and lower Snake rivers has been recognized since at least the 1990s as a significant problem for salmon and steelhead survival and recovery but federal recovery efforts have failed to address it. Last week, the federal government released its long-awaited Final EIS and 2020 Biological Opinion (“BiOp” or federal salmon plan) for endangered Columbia-Snake salmon and steelhead. These “new” documents repeat many of the government’s past mistakes, including its failure to address this deadly phenomenon of warming waters caused by the reservoirs and a changing climate. Read on to learn more about salmon advocates’ views on the FEIS and BiOp.


LSR High Temps 852020

 On the lower Snake River this week, the Little Goose Dam registered the highest temperature at 72.68°F - nearly 5°F warmer than levels that coldwater fish require. Again this week, all reservoirs except Lower Granite are registering above 68°F. Lower Granite Dam’s reservoir is hovering just below this threshold temperature.

LCR High Temps 852020

On the lower Columbia River, the John Day, McNary and The Dalles Dams all registered the highest temperatures on the Columbia River this week at 70.88°F. All four of the reservoirs on the Columbia River now exceed 68°F by more than 2°F.

Temperature data included in these reports come from the USGS Current Conditions for Washington State. Graphs and tables were assembled by SOS Staff.


On July 31st, NOAA issued its 2020 Biological Opinion and the U.S. Army Corps of Engineers, Bonneville Power Administration and Bureau of Reclamation published their CRSO Final Environmental Impact Statement (FEIS). Despite four years in the making and a cost of tens of millions of dollars, these documents fail to move beyond a costly and inadequate status quo. They leave critically endangered Columbia-Snake salmon and steelhead on the brink of extinction.

The FEIS and BiOp were ordered by the U.S. District Court in Portland in 2016 when it invalidated the agencies’ 2014 plan for Columbia-Snake River Basin salmon. They follow five previous management plans (BiOps) that also have been rejected by the courts as illegal because they did not adequately protect salmon.

The 8,000-page FEIS considers five salmon/dam management alternatives, including one that would restore the lower Snake River by removing its four federal dams. Its ‘Preferred Alternative’, however, rejects this option in favor of spilling a modest amount of water over eight dams on the lower Snake and Columbia rivers - a measure that has been widely acknowledged as an interim, stop-gap approach.

Based on the FEIS, the Biological Opinion seeks to lock in ‘flexible spill’ as a long-term program that will neither protect nor recover imperiled fish populations. If left in place as-is, this 15-year federal plan will fail endangered Columbia-Snake River salmon and perpetuate high costs and uncertainty for BPA. It will also likely lead to renewed litigation.

An effective solution for salmon and people must move beyond historic conflicts, bring people together and proactively address four urgent, connected issues:

  • Restoring abundant, fishable salmon and steelhead populations in the Columbia Basin
  • Honoring our nation’s treaty commitments to Native American Tribes.
  • Protecting and investing in the vitality of local farming and fishing communities, and
  • Continuing the region’s legacy of providing reliable, affordable, clean energy.

With the release of the FEIS and 2020 BiOp, salmon advocates are calling on Northwest policymakers, sovereigns and stakeholders to work urgently together to craft a solution that meets the needs of both salmon and people.

Links to further information:

Seattle Times: Snake River dams will not be removed to save salmon (July 31, 2020)

The Lewiston Tribune: Federal plan keeps lower Snake River dams (August 1, 2020)

Press release: Nez Perce Tribe calls for leadership on lower Snake River restoration (July 31, 2020)

Defenders of Wildlife: Salmon Be Dammed (August 3, 2020)

National Resources Defense Council: Our Rivers Are Too Dam Hot for Salmon (July 29, 2020)

Save Our wild Salmon factsheet: Columbia Basin FEIS and 2020 Biological Opinion (July 2020)

Past Hot Water Reports are archived here: Hot Water Reports - Compiled


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