Wenatchee River at Sleepy Hollow 

 (Station 6) 



The sampling point at Sleepy 

 Hollow on the Wenatchee River was 

 located cpproximately 2 miles upstream 

 from its junction with the Columbia 

 River. Major tributaries that flow 

 into the river between Stations 5 and 

 6 are Icicle Creek, Chumstick Creek, 

 Peshastin Creek, and Mission Creek. 

 In addition, the treated sewage from 

 Leavenworth, plus the raw sewage from 

 Peshastin and Cashmere, is present in 

 the river at this station. As pre- 

 viously stated, the raw sewage from 

 the City of Wenatchee is discharged 

 into the Columbia River and does not 

 influence the water at this station. 



Physical characteristics 



The physical characteristics of 

 the waters of the Wenatchee River at 

 Sleepy Hollow are tabulated in tables 

 19 and 20, and cire shown graphically 

 in figures 18 and 19. 



Chemical characteristics 



The chemical characteristics of 

 the waters of the Wenatchee River at 

 Sleepy Hollow are listed in table 21 

 and are also plotted versus time and 

 shown graphically in figures 18 and 19. 



Table 19. — Wenatchee River at Sleepy Hollow — Water 

 quality, physical characteristics, 1954, 

 1955 and 1956. 



Temperatures (* F. ) 



Turbidity (units) 



Color (units) 



Specific conductance 



(micromhos/cm at 25* C.) 



Average Minimum Maximum 

 51 32 66 



10 1 80 



10 48 



56 



31 



118 



Table 20. — Wenatchee River at Sleepy Hollow-Water 

 quality, water temperature, 1956. 



Summajy 



The characteristics of the 

 Wenatchee River at Station 6 were very 

 similar to those previously noted 

 upstream. In general there was a 

 slight downstream increase in most 

 physical and chemical chsiracteristics. 

 The amount of suspended and dissolved 

 matter was usually very low. Tur- 

 bidity and color were noticeable only 

 during March and April, 1956. A 

 saturation or super saturation with 

 dissolved oxygen was prevalent most 

 of the time during this study. The 

 water was very soft and slightly 

 alkaline . 



Wenatchee River Progressing 

 Downstream from Lake Wenatchee 



To show graphically the down- 

 stream changes that were noted in the 



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



26 



