were identical to those described by Ebei (1969) 

 and by Beiningen and Ebel (1970) . The argon 



fraction in the air is included in the listed ni- 

 trogen data. 



WASHINGTON 



21 



THE DALLES 



I'AK 



!Ma 



LITTLE GOOSE 



0AM 



2 I 



LOWER MONUMENTAL 

 DAM 



HN DAY DAM 



' ICE HARBOR DAM 



II 8 



/McNARY DAM 



50 25 50 

 I I I 



100 



150 



KILOMETERS 



Figure 1. — Location of sampling stations (station code numbers from 1 tlirough 21) on the Columbia and Snake 



Rivers, 1970. 



Table 1. — Location of sampling sites in the Columbia and Snake Rivers; 

 representative sampling sites are shown by number in Figure 1. 



Station 



code 

 number 



Sampling site 



River kilometers 



from Columbia 



River mouth 



Snake River 



1 Little Goose Dam-Forebay 696.1 



2 Little Goose Dam— Tailrace 695.1 



3 Lower Monumental Dam— Forebay 597.8 



4 Lower Monumental Dam— Tailrace (Spillway side) 596.8 



5 Ice Harbor Dam— Forebay 538.2 



6 Ice Harbor Dam— Tailrace (Spillway side) 537.2 



Columbia River 



7 Columbia River— above Snake River mouth 521.7 



8 McNary Dam-Forebay (Spillway side) 470.6 



9 McNary Dam-Forebay (Powerhouse side) 470.6 



10 McNary Dam— Tailrace (Powerhouse side) 469.6 



11 McNary Dam— Tailrace (Spillway side) 469.6 



12 John Day Dam— Forebay 347.6 



13 John Day Dam— Tailrace (Spillway side) 346.6 



14 The Dalles Dam-Forebay 308.8 



15 The Dalles Dam— Tailrace (Spillway side) 307.8 



16 Bonneville Dam— Forebay 235.7 



17 Bonneville Dam— Tailrace (Spillway side) 234.7 



18 Columbia River at Washougal 195.9 



19 Columbia River above mouth of Willamette 171.5 



20 Columbia River near Prescott 109.0 



21 Columbia River at Harrington Point (Astoria) 37.8 



