A discussion of existing and proposed 

 facilities at these dams for the passage of 

 migratory fish is beyond the scope of this 

 study. 



SCOPE OF THE STUDY 



This study is specifically related to 

 hydroelectric projects that have been pro- 

 posed by the Chelan and Grant County Public 

 Utility Districts on the Wenatchee and 

 middle Columbia Rivers. Water quality aind 

 biological data have been collected, docu- 

 mented, and analyzed in the river sections 

 that will be affected by these future dams. 

 Biological data were gathered only in the 

 Wenatchee River Basin. This report on the 

 study is divided into two sections: a sec- 

 tion on water quality, and a section on the 

 biological studies —' in the Wenatchee River 

 Basin. Some of the data included herein 

 were obtained on a previous study (^) by the 

 University of Washington for the U. S. Fish 

 and Wildlife Service. This previous con- 

 tract extended from June 1954 to December 

 1956, whereas the contract for the study 

 reported herein extended from June 27, 1956, 

 to September 15, 1957. Data collected by 

 the U. S. Fish and Wildlife Service in 1939 

 and 1940 are included where applicable (24). 



_!/ Biological section no* included. 



Data sampling stations were selected 

 to bracket the area; to lie near sites for 

 the proposed dams; to include a riffle area 

 if biological sampling was involved; to 

 include a bridge, if possible, for ease and 

 reliability of sampling; and to include 

 tributary streams where water quality data 

 would help explain quality changes in the 

 main stream. The sampling stations, as 

 listed in table 2, carry a station number 

 assigned in the previous survey (5). Fig- 

 ures 3-6 (pages 5-8) show the locations 

 of the University sampling stations and 

 those of the U. S. Fish and Wildlife Ser- 

 vice. Stations 16, 47, 23, and 42 were 

 selected to bracket the study area on the 

 Columbia and Wenatchee Rivers. Stations 

 13, 14, 17, 37, and 43 were selected as 

 they would give water quality data relating 

 to the primary stations that were located 

 in the vicinity of the proposed dams. Sta- 

 tion 38 (see fig. 3) is located between the 

 Priest Rapids and Wanapura Dam sites. This 

 is a difficult section of the Columbia River 

 to sample because a bridge or boat was not 

 available and because the shoreline depth 

 and point of sampling will change with the 

 change in river flow depth. Station 40 is 

 located at the upstream end of the future 

 Wanapum reservoir; station 44 several miles 

 below the proposed Wenatchee reservoir; 

 station 46 just below the proposed Wenatchee 

 reservoir; and station 47 is located near 



Table 2. --Location of sampling stations. 



13 Columbia River at McNary Dam 



14 Snake River near mouth 



16 Columbia River at Pasco 



17 Yakima River near mouth 



22 Yakima River near Thorp 



23 Wenatchee River near mouth 



37 Crab Creek near mouth 



38 Columbia River above Priest Rapids 



40 Columbia River at Rock Island Dam 



41 Lake Wenatchee 



42 Lake Wenatchee 



43 Nason Creek near mouth 



44 Chiwawa River near mouth 



45 Wenatchee River below Plain 



46 Wenatchee River in Tumwater Canyon 



47 Columbia River at Beebe 



292 

 326 

 32 8 

 340 

 493 

 471 

 411 

 409 

 453 

 528 

 526 

 523 

 524 

 514 

 503 

 504 



Water quality only 



Water quality and biological 

 Water quality only 



Biological only 



Water quality and biological 



Water quality only 



