Chemical characteristics 



The chemical chciracteristics of 

 the waters of Nason Creek as deter- 

 mined during this study are listed in 

 table 6. These chemical characteris- 

 tics are plotted against time and 

 shown graphically in figures 8 and 9. 



Summary . The waters of Nason 

 Creek contained very little suspended 

 or dissolved matter. They were prac- 

 tically neutral and very soft. Color 

 and turbidity were noticeable only 

 on one occasion during the period of 

 sampling. The waters were practi- 

 cally saturated with dissolved oxy- 

 gen. Temperature of the water was 

 subject to significcmt diurnal varia- 

 tions during the warm weather months. 



Nason Creek — Comparison of 

 1940 and 1955-1956 Data 



Table 6. — Nason Creek — Water quality, chemical 



characteristics, 1955-1956 -■ 



1/ 



1/ All units are ppm except pH and percent saturation. 



In 1940 a quantitative study of 

 the food available to fish on the 

 bottom of Nason Creek was made by the 

 United States Fish and Wildlife Ser- 

 vice. A limited amount of physical 

 and chemical water quality data were 

 also obtained during May through 

 November of that year. The results 

 of this investigation present a basis 

 for comparison of the two studies, 

 as is shown in table 7. 



While these data were limited 

 and did not cover exactly the same 

 seasonal period, their striking 

 sirailjirity indicated the water of 

 Nason Creek had not been altered 

 during the time interval. 



Table 7. — Nason Creek — Water quality 

 1940 and 1955-1956. 



Average dissolved oxygen (ppm) 

 Average percent saturation D.O. 

 Average carbon dioxide (ppm) 

 Average pH 

 Average total alkalinity (ppm) 



1940 1955-1956 



10.9 10.7 



96 96 



1.9 1.5 



6.9 6.9 



13 15 



Chiwawa River (Station 2) 



The Chiwawa River is fed by 

 small glaciers near the Cascade sum- 

 mit. It flows for 27 miles before 

 entering the Wenatchee River just 

 above Plain. 



Physical characteristics 



The physical characteristics of 

 the waters of the Chiwawa River are 

 shown in tables 8 and 9. These 

 physical characteristics are plotted 

 versus time 2Uid are shown graphically 

 in figures 10 and 11. 



Table 8. — Chiwawa River — Water quaility, physical 

 characteristics, 1955-1956 



Temperature (• F.) 



Turbidity (units) 



Color (units) 



Specific conductance 



(micromhos/cm at 25' C.) 



Average Minimum Maximum 

 45 32 58 



6 2 12 



7 5 12 



46 



29 



60 



14 



