CONTENTS 



Introduction „ <, . c . « . « . . 



Digest of principal findings . < 

 Standards and methods . . » <, . 

 E'/aluation of streams . . . o > 

 Control procedures ....... 



Recotimendations for future work 

 Literature cited . » . . . . . < 



9 O 9 O O O 



Page 



o , 1 



, . 2 



. , 5 



, . 8 



. . 65 



. . 66 



. . 67 



ILLUSTRATIONS 



FIGURE 



2o 



3. 



6, 



7. 



8. 



9. 



10. 



11, 



12 o 



13. 



lUo 



15 



Lake Superior; showing the areas, and their 

 arbitrary subdivisions, surveyed in 1950 and 195l< 



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e\S. C^a._PoooaoOi>oocioaoeooo*o«o< 



Area U . 



Area 5 « 



Area 6 . 



Area 7 . 



Area 8 „ 



Area 9 » 



Area 10 



Area 11 



Area 12 



Area 13 



_ - Area lU 



l6. Area l5 



17 o Area l6 



Area 1? 



Area 18 



Area 19 



Area 20 



Area 21 



Area 22 



18 



19. 



20. 



21. 



22, 



23, 



Page 



9 

 11 

 13 

 15 

 17 

 19 

 22 

 25 

 27 

 29 

 31 

 33 

 35 

 38 

 Uo 

 U2 



a6 



U8 

 51 

 Sk 

 56 

 60 



