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Memo to Northwest writers, reporters, editorialists, and columnists – Aug. 21, 2013

Columbia River temperatures over 70 degrees continue

From August 12 through 18, water temperatures were 70 degrees or higher 63 times at Columbia and Snake River federal dams passable to salmon, up from 56 times last week. Temperatures at The Dalles and John Day Dams have been 70 F or higher 25 straight days, and have been above 70 F at all four main-stem Columbia dams for 10 straight days.  At Ice Harbor Dam on the Snake River, temperatures have been above 70 F 31 straight days – a full month.  On August 17, temperatures at The Dalles and John Day Dams hit 72 F, the highest reading so far this summer.  

Total daily exceedances for the summer are nearing 200.   This week’s specifics:
 
Forebay (above dam) Tailrace (below dam)

Bonneville Dam     
Aug 12    71.2 F     71.3 F
Aug 13    71.3 F     71.3 F
Aug 14    71.3 F     71.4 F
Aug 15    71.4 F     71.4 F
Aug 16    71.6 F     71.6 F
Aug 17    71.8 F     71.9 F
Aug 18    71.8 F     71.8 F

The Dalles Dam         
Aug 12   71.3 F     71.4 F
Aug 13   71.4 F     71.5 F
Aug 14   71.6 F     71.7 F
Aug 15   71.7 F     71.8 F
Aug 16   71.8 F     71.9 F
Aug 17   71.9 F     72 F
Aug 18   71.8 F     71.9 F

John Day Dam       
Aug 12    71.5 F     71.4 F
Aug 13    71.6 F     71.6 F
Aug 14    71.9 F     71.8 F
Aug 15    71.9 F     71.8 F
Aug 16    71.8 F     71.8 F
Aug 17    71.9 F     72 F
Aug 18    71.8 F     71.8 F

McNary Dam       
Aug 12    70 F
Aug 13    70.3 F
Aug 14    70.7 F
Aug 15    70.9 F
Aug 16    71.4 F
Aug 17    71.5 F
Aug 18    71.5 F

Ice Harbor Dam         
Aug 12    70.3 F    70.8 F
Aug 13    70.3       70.6 F
Aug 14    70.2 F    70.8 F
Aug 15    70.2 F    70.7 F
Aug 16    70.1 F    70.7 F
Aug 17    70.1 F    70.4 F
Aug 18    70.1 F    70.5 F

Fish species now migrating, and thus being exposed to these very stressful temperatures, include Columbia and Snake River fall chinook salmon, Columbia and Snake River steelhead, and Pacific Lamprey.
 
Columbia-Snake temperatures are at http://www.fpc.org/tempgraphssl/NETFullYear_tempgraph.aspx
 
For more information, please contact:

Joseph Bogaard, deputy director, 206-286-4455 x103, joseph@wildsalmon.org;

Gilly Lyons, policy director, 503-975-3202, gilly@wildsalmon.org

 

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