Slide background
SOS Blog

Save Our Wild Salmon


Issue 8 - August 23rd, 2019

Welcome to the Hot Water Report, Week 8. This weekly report during Summer 2019 will present conditions - including water temperatures and status of salmon and steelhead returns - on the lower Snake and Columbia rivers via graphs, analyses, and stories. The harmful effects on struggling fish populations caused by federal dams and their reservoirs is now being exacerbated due to our warming, changing climate.

Each week’s report gives a real-time update on water temperatures in the lower Snake and Columbia River reservoirs, the highest weekly temperature in each reservoir, and the status of adult returns for different species as they make their way back toward their natal spawning grounds. We’ll hear from scientists, fishers, guides, and salmon advocates about challenges facing the Columbia and Snake rivers - and the opportunities to improve their health and begin to rebuild healthy, resilient fish populations and the many benefits they deliver to Northwest culture, economy and ecology.

High sustained summer reservoir temperatures are now routine in the basin during the summer months. Salmon and steelhead begin to suffer harmful effects when water temperatures exceed 68° Fahrenheit. The longer temperatures remain above 68° and the farther the temperatures rise above 68°, the greater the harm, including increased energy expenditure, increased susceptibility to disease, reduced fecundity or reproductive potential, and/or death. 

If you are unfamiliar with the location of the lower Snake and Lower Columbia rivers and their dams, find them on this map.

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

The Hot Water Report is a joint project of the Save Our wild Salmon Coalition, Idaho Rivers United, Idaho Conservation League, Sierra Club, Friends of the Clearwater, Columbia Riverkeeper, Pacific Rivers, American Rivers, and Natural Resource Defense Council.


The daily mean temperature at the forebay - the upstream side of each dam - is represented with solid lines, while the 10-year average (2009-2019) for each reservoir is represented by the dashed line of the same color. For this initial report, 10-year historic data was only available for 4 of the 8 dams we will be monitoring. Finally, the dotted line across the top of the graph represents the upper end of the 68° F “comfort zone” for juvenile and adult salmon. 


Harmful water temperatures continue in the lower Snake and lower Columbia river reservoirs: Temperatures in the Snake River reservoir have fortunately began to plateau, although they remain well above the 10-year average and all but the reservoir at Lower Granite dam are well above the safe 68° safe threshold for salmon.


Temperatures on the Columbia River have also begun to level off and converge around 71.5°, 3.5° above safe temperatures for salmon. 



With the exception of Lower Granite on the lower Snake, none of the other reservoir temperatures this week have beat their “record high” for this year, although they did all spend the entire week well outside of the temperature range that is considered safe for salmon and steelhead. At this point, all of these reservoirs have spent 4 weeks almost consecutively above 68°F. And remember, the longer and higher that temperatures remain above this level, the more the negative impacts accumulate for salmon and steelhead that are in the river at these times. 

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

FEATURED FISH: Snake River Fall Chinook


After August 1st, all chinook that pass into the Columbia-Snake river system are designated as part of the fall chinook run. We are just beginning to see these salmon cross over Bonneville dam. There have not yet been sufficient returns to Lower Granite dam to display in a graph, as the run just began.

It is still early in the season for these fish, but pre-season estimates for these stocks are low. Projections for fall chinook returning to the Columbia and Snake Rivers in 2019 are just 350,000 - 67% of what have returned on average over the last 10 years. The vast majority of these will return to the Columbia River rather than the Snake. So far, returns are tracking more closely to 2018’s dismal numbers than to the 10-year averages. We’ll need more time and information before we know how this year’s actual fall chinook return.

THE COLUMBIA-SNAKE SALMON NEPA REVIEW: Illegal Dam Operations and the environmental review now under way. Is the fix already in?

salmon.dead.beachOver the past two decades, the federal government has produced five consecutive plans under the Endangered Species Act that are supposed to ensure salmon-safe dam operations in the the Columbia-Snake River Basin. Federal judges, however, have invalidated all five plans as inadequate and illegal. The most recent plan was rejected in 2016. The judge determined that the federal agencies’ (BPA, ACOE) plan violated the law (ESA and NEPA) in numerous ways, and he ordered them to produce a new plan and to complete a new comprehensive environmental impact statement (EIS) by 2021 (see issue 6 for more detail) that examines all credible salmon recovery alternatives, including the removal of the four lower Snake River dams.  

Salmon and fishing advocates were initially encouraged by this court order. The development of an up-to-date environmental review represented a huge opportunity to inform a new, legally-valid, science-based plan that truly and finally protects healthy salmon and steelhead populations in the Columbia and Snake rivers. Done well, this review could drive and inform a much-needed dialogue among policymakers, stakeholders and the public about the needs of salmon, orca and Northwest communities. With salmon returns in recent years in steady decline (2019 returns are among the lowest on record and three orca deaths occurred earlier this summer), there is no time to waste. 

The Northwest urgently needs an effective, lawful plan that protects endangered salmon and orcas and invests in affected communities. The federal agencies could have seized this opportunity - and conducted a full and fair environmental review and laid the foundation for a lawful, science-based plan that truly works for salmon, orcas, and communities. But that is not what it appears they are doing.

Unfortunately, the evidence today indicates that the agencies are doing all they can to produce another failed, costly, risky and illegal status quo plan that will perpetuate conflict, increase costs and uncertainty for communities, and push salmon and orca ever closer to extinction. 

If salmon advocates’ fears are realized, this court-ordered NEPA review will be one more painful missed opportunity for critically endangered salmon and orcas, and for the people of the Northwest and the nation. Increasingly, the focus must turn to the region’s elected officials and other policymakers whose engagement and leadership working with each other, with stakeholders and with the public is needed to finally craft an effective plan that protects salmon and the benefits they bring to the Northwest in a manner that also invests in affected communities and brings everyone forward together.

Links to further information:

KNKX: ‘Hot Water Reports’ use government’s own data to highlight unsafe conditions for fish (August 19, 2019)

Previous Links:

CBB: Snake River Sockeye Run Lowest In More Than A Decade, Currently 6 Percent Of 10-Year Average (August 8, 2019)

CBB: Upriver Steelhead Forecasts Down, B-Run 24 Percent Of Average; Idaho Considers Extending Fall Chinook Fishing Areas In Clearwater (August 8, 2019)

Seattle Times: Three southern resident orcas missing, presumed dead (August 7, 2019)

Boise Weekly: Salmon Runs in 2019 Expected to Be Lower Than 2017, 2018 (August 7, 2019)

Columbia Basin Bulletin: More Salmon/Steelhead To Columbia River Than Last Year, But Forecasts Mixed Among Species (March 15, 2019)

CBB: Corps releases Dworshak water to cool Lower Granite tailwater for Salmon; Low sockeye run downgraded by one-third (July 11, 2019)

Idaho Fish & Game: Very few sockeye salmon returning to Idaho (July 9, 2019)

Lewiston Morning Tribune: Spring Chinook Season Comes to a close (June 5, 2019)

Seattle Times: Chinook bust on the Columbia - Spring returns worse than forecast on Northwest’s largest river (May 30, 2019)

Seattle Times: Hunger, the Decline of Salmon Adds to the Struggle of Puget Sound’s Orca (February 24, 2019)

Past reports are archived here: Hot Water Reports - Compiled

Share This