Chemical characteristics 



The chemical characteristics of the 

 waters of the Chiwawa river determined 

 during this study are shown in table 10. 

 These chemical characteristics are plotted 

 against time and are shown graphically in 

 figures 10 euid 11. 



Summary 



A general description of the waters of 

 the Chiwawa River would emphasize the low 

 content of suspended and dissolved matter, 

 the softness and neutral pH. Color and 



Table 9. — Chiwawa River — Water quality, water temperature 



1956 



1/ Not available. 



Table 10. — Chiwawa River — Water quality, chemical 

 characteristics i' , 1955-1956 



turbidity were consistently low, although 

 the Chiwawa is known to be turbid during 

 the late spring and early summer freshets. 

 For practical purposes the waters were con- 

 sidered saturated with dissolved oxygen. 

 A significant diurnal variation in tempera- 

 ture was observed during the summer months. 

 In general, the combination of factors in 

 the drainage basin produced a water of 

 excellent physical aind chemical character- 

 istics. 



Lake Wenatchee (Station 3) 



This lake located at the head of 

 the Wenatchee River is about 5 miles 

 long and 1 mile wide (fig. 12). It is s 

 deep lake with the depth generally 

 around 150 to 200 feet. The shore- 

 line is rocky, wooded, and in places 

 lined with summer cottages. The ele- 

 vation of the water surface is 1,870 

 feet above mean sea level. There is 

 a State Park at the lower end; and at 

 the upper end, near the mouths of the 

 Little Wenatchee Jind White Rivers, 

 there is a swampy area. The lake is 

 an important rearing area for sockeye 

 salmon in the Columbia River System 

 (Bryant and Parkhurst, 1950). 



Water quality sampling from the 

 lake was interrupted by severe 

 weather during the winter of 1955- 

 1956. The lake was completely frozen 

 over from early February through late 

 April 1956. 



1/ All units ppm except percent saturation and pH. 



Physical characteristics 



The physical characteristics of 

 the Lake Wenatchee water at depths 

 of 10, 75, and 175 feet are shown in 

 table 11. 



Chemical characteristics 



The chemical characteristics of 

 the lake waters are tabulated in 

 table 12. 



Summary 



The waters of Lake Wenatchee 

 were characterized by their unusually 

 low content of suspended cUid dis- 

 solved matter. The most significant 

 variable with depth was temperature. 



17 



