change in fish population, and a general 

 decrease in biological productivity. The 

 data from this study will provide a basis 

 for comparison to verify these aforemen- 

 tioned effects. 



The combination of characteristics in 

 the Wenatchee River Basin has formed a 

 watershed that is capable of conserving and 

 supplying waters of excellent physical and 

 chemical quality. The fact that relatively 

 insoluble granite is the major rock in the 

 basin has an important effect on the water 

 quality. Most of the drainage basin is 

 part of the Wenatchee National Forest which 

 practically precludes the detrimental effect 

 of overgrazing and excess logging. The very 

 sparse population and almost complete lack 

 of industry keep the discharge of deleteri- 

 ous substances to the streams at a minimum. 

 In conclusion it may be stated that the 

 Wenatchee River System is indispensable for 

 the continued prosperity of the irrigated 

 agriculture in the valley and is very impor- 

 tant as a producing area for blueback salmon 

 in the Columbia River System. 



ACKNOWLEDGMENT 



The writer desires to express his 

 appreciation to Professor Robert 0. Syl- 

 vester, Department of Civil Engineering, 

 University of Washington, for the guidance 

 jtnd assistance received during the progress 

 of this work. The aid rendered in the 

 collection of data by Professor Holger P. 

 Mittet, Charles P. Ruggles, Gerald H. Hans- 

 ler, William V. Pye, William Peterson and 

 James Gustafson, all of the University of 

 Washington, is gratefully acknowledged. 

 Appreciation is cilso expressed to the United 

 States Fish and Wildlife Service and Public 

 Utility District No. 1 of Chelan County for 

 coverage of expenses incurred in the collec- 

 t^on of data. 



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34 



