PROGRESS IN BIOLOGICAL INQUIRIES, 19 29 1097 



essentially of a cylinder of heavy wire mesh material, placed in an 

 approi^riate supporting structure and made to revolve on a hori- 

 zontal axis in the direction of the stream flow. The motive power is 

 furnished by paddle or bucket wheel placed in the ditch below the 

 screen, and a necessary by-pass channel is provided for the return 

 of the fish to the main stream. The economic field of application for 

 screens of this type seems to be the small to moderately large 

 diversions. 



As part of the work of this investigation the Bureau of Fisheries 

 has designed and is now completing the installation of a revolving 

 screen of this type on the Atanum ditch of the United States Indian 

 Service. This ditch diverts Mater from Atanum Creek, about 17 

 miles southwest of Yakima, Wash. 



Atanum Creek is frequented by both salmon and steelhead, and for 

 ;i number of years there has been heavy loss of downstream migrants 

 into this unscreened ditch. 



W. R. Coleman, superintendent of fish screens and fish ladders 

 for the Oregon Game Commission, has assisted in design and con- 

 struction. The entire cost of the installation has been borne by the 

 United States Bureau of Fisheries. 



ELECTRIC FISH SCREENS 



Early in the investigation the possibilities of the electric screen 

 were realized. In the summer of 1926 Prof. F. O. McMillan, de- 

 partment of electrical engineering, Oregon Agricultural College, 

 and J. E. Yates, engineer. Pacific Power & Light Co., Portland, 

 Oreg., conducted experiments on the electric fish screen at Bonne- 

 ville hatchery, Oreg.* In the spring of 1928 Messrs. McMillan 

 and Yates installed for the California-Oregon Power Co. an elec- 

 tric fish screen in the tailrace of the power plant at Gold Ray on 

 the Rogue River in Oregon. In September, 1928, H. T. Burkey 

 of Pasadena, Calif., holder of United States patents on the elec- 

 tric fish screen requested opportunity to show his device, which 

 was afforded him at the Delph Creek hatchery, Oreg., where he 

 set up a small installation for a demonstration. Though made in 

 still water and against trout this demonstration was sufficiently 

 interesting to warrant a large-scale test under actual field condi- 

 tions. This installation was made by the United States Bureau of 

 Fisheries in the Tieton Canal of the United States Reclamation 

 Service and was operated for a month. 



These experiments seemed to justify making permanent installa- 

 tions with the result that plans were adopted and carried out to 

 place electric fish screens of this type at the following locations: 

 (1) Sunnyside Canal. Yakima project, United States Reclamation 

 Service; (2) Tieton Canal, Tieton project. United States Reclama- 

 tion Service; (3) AVapato Canal, Wapato project. United States 

 Indian Service; and (4) intake of Gold Ray power plant, Cali- 

 fornia-Oregon Power Co. 



* Electric Fish Screen (with bibliography) ; by F. O. McMillan. Bui., vol. 44, 192S. 

 34 pp., 21 illus. 



