tunnels, power plani:s, and canals leading from the diversion dam to the 

 Saciranonto River above Keswick Dam. A second plan contemplates con- 

 struction of a storage dam near Browns Creek, some 6 miles below Douglas 

 City* Water front this reservoir would be piimpad to the diversion tunnel 

 above Lewis ton. The point of diversion from the Trinity River at Lewis ton 

 is about 1300 feet above the Sacramento River. 



Dams at the Fairview and Browns Creek sites would be high barriers 

 insurmountable by present type of fish ladders. Reservoirs formed by 

 t:ieso daas would be very long, extensive, and would cover much of the 

 existing spawning grounds of anadromous fishes. Ttiese fishes might be 

 lifted mechanically over the dans, but it is doubtful that their offspring 

 would pass through the reservoirs, find the river outlets, and proceed 

 downstream without suffering material losses. Mos-c of the water would 

 fiorw into the diversion tunnel and with it the majority of the young 

 salmon and trout produced upstream. 



Alir.ost without exception. Trinity River salmon migrating above 

 the South Fork spawn in the 72 miles of river between the North Fork 

 and Ramshorn Creek. In addition to the main river, three tributaries 

 are used by spawning salmon. A dam at the Lewis ton site would cut off 

 35 miles of the main river and all of Stuart Fork, the most important 

 spawning tributary. The saljnon would be blocked from approximately 

 50 percent of their natural spawning grounds in the upper Trinity. A 

 dam at the Browns Creek site would cut off the remaining two spawning 

 tributaries and 59 miles of the main river spawning area* This dam 

 would eliminate seme 82 percent of the natural salmon spawning area. 



Appreciation is expressed for the help given by the State of 

 California Division of Fish and Game and by many persons who were 

 connected with the work from time to time. Among these were Dr. Paul 

 R. Needham, who directed the project until the end of 1944, Harry A. 

 Hanson, George Warner, Owen Vivian, William H. Davenport, Millard 

 Coots, Donald Drake, S.N. MoKinsey, Norman Mattoon and many residents 

 of Lewiston who assisted with work on the project. Much of the infor- 

 mation included has been generously supplied by the U. S. Bureau of 

 Reclamation, U. S. Engineers, U. S. Forest Service, and the U. S. 

 Geological Survey. The Indian Agency at Hoopa, on the lower Trinity 

 River, also cooperated. 



This investigation was supported by funds transferred to the Fish 

 and Wildlife Service by the Bureau of Reclamation. It was considered 

 a vital part of the pre-project engineering and exploratory work con- 

 ducted by the Bureau of Reclamation. Tlie study was terminated in 

 August 1946, when the Bureau of Reclamation ceased active work on the 

 Trinity River diversion project. 



