FIGURES 



No. Page 



1. Columbia River Basin, showing area covered in 



study Frontispiece 



2. Major dam locations, vicinity survey area 2 



3. Middle Columbia River sampling stations 5 



4. Wenatchee River Basin 6 



5. Lake Wenatchee 7 



6. Location of U. S. Fish and Wildlife Service sampling 



stations in Wenatchee River Basin, 1Q39-40 8 



7. Water quality of Columbia River at McNary Dam 28 



Q II It II II II II II It OQ 



0. Water quality of Snake River at mouth 31 



ir\ II II II It It II It -3'j 



11. Water quality of Columbia River at Pasco 34 



^^ -y II It It II IT till o r 

 « ■....•.•• 



13, Water quality of Yakima River at Enterprise 37 



1^ II It It It II n" II -30 



15. Water quality of Yakima River above Thorp 40 



16. " " " " " " " 41 



17. Water quality of Wenatchee River near mouth 43 



18. " " " " " " " 44 



19. Water quality of Crab Creek at Beverly 46 



20. " " It tt It It It 4y 



21. Water quality of Columbia River below Vantage 49 



22. " " " " " " " 50 



23. Water quality of Columbia River at Rock Island 52 



p A It It It It It lilt It I- o 



25. Water quality of Nason Creek near mouth 56 



O^ It It It It II II II ry 



27. Water quality of Chiwawa River near mouth 59 



28. " " " " " " " 60 



29. Water quality of Wenatchee River below Plain 62 



'jr\ It II It II It It It iio 



31. Water quality of Wenatchee River at Tumwater Canyon ... 65 



-jp It It I' It It It It It zi ^ 



33. Water quality of Columbia River at Beebe Orchard Bridge . 68 



34. " " " " " " " " " . 69 



35. Range in daily water temperatures, Wenatchee River Basin . 96 



36. Range in daily water temperatures, Columbia, Yakima 



and Snake Rivers 97 



37. Average monthly water temperatures, Wenatchee River, 



1956 99 



38. Lake Wenatchee water temperature with depth 100 



39. Typical water temperature gradients, Lake Wenatchee . . . 101 



IV 



