THIRTY-SEVENTH BIENNIAL REPORT 55 



completed and placed in operation. Of the installations made 21 were 

 in Trinity County, 23 in Siskiyou, six in Shasta, and the remainder in 

 three separate counties. In general the screen installations were self- 

 cleaning of the reverse rotar^v type or the parallel bar type. Concrete 

 foundations were used throughout. 



Periodic inspections of their operation have been maintained and 

 data at hand show that a reasonable degree of effectiveness has been 

 attained in the protection of fish life with no adverse results to the 

 water diverter. It has been observed that the installation of fish screens 

 in certain locations has resulted in the creation of new fishing areas and 

 improvements in others. 



The general routine work of the bureau included over 200 special 

 investigations or insjoections and about 500 designs, maps, sketches, or 

 plans were prepared. Some of these were rather extensive and a number 

 are basic and will be used, in part at least, in the future. 



A surve.y party was in the field during the major part of the bien- 

 nium and for short periods there were two parties. Further field 

 surveys would have been made if men and money had been available 

 when needed. Ten surveys were made for the Bureau of Fish Conser- 

 vation. Although the major portion of these were of a preliminary 

 nature, usually for proposed hatchery sites, a number were more 

 detailed in scope and preparatory for actual construction. This latter 

 listing includes the Fillmore ponds, though the construction was done by 

 the Bureau of Fish Conservation. Three surveys were made for the 

 Bureau of Game Farms for the determination of property lines and 

 additions and nine surveys were made for the Bureau of Game Con- 

 servation. All of the latter surveys were made in conjunction with 

 investigations of sites and projects under the provisions of the Pittman- 

 Robertson Act and administered by the United States Fish and Wildlife 

 Service. This work included the survey and mapping of a 2,100-acre 

 ranch in Lassen County which is under purchase under the terms of 

 the Pittman-Robertson Act. Plans will be prepared covering a project 

 for the improvement of this property. 



Surveys and estimates were likewise prepared and submitted for 

 the improvement of the Gray Lodge Refuge located about 10 miles west 

 of Gridley. This refuge comprises an area of 2,540 acres. The project 

 has been approved but work will probably be delayed due to war 

 conditions. 



For some years the Bureau of Game Conservation has maintained 

 the Suisun Game Refuge on Joice Island, located about five miles south 

 of Suisun and near Suisun Bay. Surveys aiid engineering studies were 

 carried on and a project was submitted to the United States Fish and 

 Wildlife Service in accordance with the terms of the Pittman-Robertson 

 Act. This project proposed raising the levees and the placing of four 

 redwood gate structures, all designed for optimum operations of this 

 1,711-acre refuge with its 14 miles of levees. A contract was let and 

 131,000 cubic yards of dredged material was placed on eight miles of 

 levees. 



The bureau constructed two cottages for the Bureau of Game Farms, 

 one at the Yountville Farm and the other at the Los Serranos Farm. 

 The Yountville cottage was a four -room structure while the Los Serranos 



