REPORT OF THE FISH AND GAME COMMISSION. 47 
Among the important ditches screened during the last two seasons are 
the following : 
Phelan-Crouch ditch and Pacifie Gas and Electric Company ditches 
in Butte County, Southern California Edison ditches in San Bernardino 
County, Anderson-Cottonwood Irrigation Company canal in Shasta 
County, Northern California Power Company canals in Shasta and 
Tehama counties, Pacific Gas and Electric Company ditches in Shasta 
County, and California-Oregon Power Company and McCloud River 
Lumber Company ditches in Siskiyou County. 

Fig. 4. -Views of the fishway at City Water Works Dam on the Napa River near Napa, Cali- 
ee one of the best fishways in the state. Photographs by A. E. Downey, August 4, 
Of all the screens installed in the large canals in this state since the 
work was commenced in 1912, that of the Anderson-Cottonwood Irri- 
gation District on the Sacramento River, Shasta County, is the most 
worthy of mention. (See Fig. 5.) It is the first attempt ever made 
to construct a rotary screen of large design, and the success of this 
installation is most gratifying to both the district and this department. 
The screen was designed by Mr. Thos. H. Means, consulting engineer, 
and Mr. A. R. W. Sperry, supervising engineer of the irrigation dis- 
trict, assisted by this department, and is patterned after the Southern 
California Edison type of moderate-sized rotary automatic cleaning 
screen. The device consists of three units, each nine fect long and 
twelve feet in diameter. 
After four years efforts we finally entered into an agreement with the 
Northern California Power Company whereby they agreed to screen 
their eight large canals in Shasta and Tehama counties. 
A portion of the screens were installed this summer, but owing to the 
impossibility of obtaining materials for them all, it will be the first of 
December before they are all completed. 
The Stanford Vina and Durham ranches have at last contracted for 
efficient screens for their canals and ditches with Mr. R. W. Requa of 
Chico, California, 
