There are numerous irrigation dams and diversions in the Boise 

 River system, of which only the most important are mentioned briefly 

 in this reporto Detailed reports on the fish and wildlife aspects 

 of the several federal irrigation and power projects have been made 

 by the U. S. Fish and Wildlife Service, Office of River Basin Studies. 



J/ 



The Barber dam and power plant is located about U miles above 

 the city of Boise or approximately 5U miles above the mouth It is 

 21 feet high and is a barrier to fish„ 



The New York canal diversion dam located 7 miles upstream above 

 Boise is 28 feet high and equipped with a poor fishway which was 

 impassable at the time of inspectiono 



Arrowrock Dam, 22 miles above Boise, has an effective height of 

 253 feet when the reservoir is filled to capacity, and is a barrier 

 to fish. 



These and numerous minor obstructions and diversions render the 

 Boise River system of little possible value to anadromous fish. 

 However, the reservoir areas are capable of maintaining a greatly 

 increased sport fishery for suitable resident species „ 



2A. South Fork . — (Not surveyed in detail.) The South Fork 

 enters the Arrowrock reservoir approximately h miles above the Arrow- 

 rock dam. The reservoir extends 10 miles up the South Forko The 

 South Fork extends for a distance of approximately 110 miles. A 

 large part of the course is through a narrow, steep, rocky canyon, 

 which gradually widens above Lime Creek, entering 10 miles above 

 Anderson Ranch Dam, to form a valley about 1/2 mile wide. 



The Anderson Ranch dam, constructed by the U. S. Bureau of 

 Reclamation on the South Fork approximately Ul miles above Arrowrock 

 Dam, is nearing completion with the installation of power generating 

 facilities. This dam was designed primarily for supplemental irri- 

 gation in conjunction with Arrowrock Dam as a part of the Boise pro- 

 jecto However, it has additional benefits for power production and 

 flood control© The dam raises the water level a height of 322 feet, 

 and is impassable to fish. The reservoir extends for lU mileso 



"17 



Arrowrock Division Boise Project, Boise River, Idaho. Report on 

 fish and wildlife resources. U.S. Fish and Wildlife Service, River 

 Basin Studies, Washington, D.C. 1950. 



15 



