seasonal period and made an interest- 

 ing basis for comparison. The data 

 from the sources are presented 

 graphically in figure 13. 



Wenatchee River at Plain 

 (Station 4) 



The Wenatchee River near Plain 

 has a drainage area of 591 square 

 miles and is fed mainly by Lake 

 Wenatchee, Nason Creek, and the 

 Oiiwawa River. 



Sampling at this station was 

 interrupted by an unusually heavy 

 snowfall during the winter of 1955- 

 1956. No water quality data were 

 obtained from November through 

 February of that period. 



Physical characteristics 



The physical characteristics 

 of the waters of the Wenatchee River 

 at Plain are shown in tables 13 and 

 14. 



These physical characteristics 

 are plotted versus time and shown 

 graphically in figures 14 and 15. 



Chemical characteristics 



Table 13. — Wenatchee River at Plain — Water quality, 

 physical characteristics, 1955-1956. 



Temperature C F.) 



Turbidity (units) 



Color (units) 



Speci-fic conductance 



(micromhos/cm at 25" C.) 



Average Minimum Maximum 

 53 37 63 



8 2 40 



10 5 45 



31 



22 



49 



Table 14. — Wenatchee River at Plain — Water quality, 

 water temperature, 1956-. 



Month 



August 



September' 



October 



November 



December 



The chemical characteristics 

 of the waters of the Wenatchee River 

 at Plain are listed in table 15. 

 The chemical characteristics plotted 

 against time are shown graphically 

 in figures 14 and 15. 



Summary 



The water in the Wenatchee 

 River at Plain is largely a mixture 

 of flow from Nason Creek, Chiwawa 

 River, and Lake Wenatchee. Conse- 

 quently, its characteristics were 

 very similar to the aforementioned 

 waters. As previously stated, they 

 were in general characterized by 

 their low suspended ajid dissolved 

 matter content, their softness and 

 neutral pH. The maximum diurnal 

 variation in the water temperature 

 was less in the Wenatchee River 

 than that found in Nason Creek and 

 the Chiwawa River. 



Table 15. —Wenatchee River at Plain— Water quality 



chemical characteristics, 1955-1956 



1/ 



Dissolved 



Percent saturated D.O. 



Carbon dioxide 



pH 



Total hardness 



Alkalinity 



Sulfates 



Ammonia 



Total solids 



Average Minimum Maximum 



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



20 



