486 ANNUAL REPORT SMITHSONIAN INSTITUTION, 1915. 



yields are doubled with irrigation. Forage crops predominate, but 

 potatoes are successfully grown and small areas of fruit trees have 

 yielded well. 



BELLE FOURCHE PROJECT, SOUTH DAKOTA. 



Near the town of Belle Fourche, S. Dakota, the river of the same 

 name has been utilized to irrigate lands east of the town. A diver- 

 sion dam in the river turns the flow into a feed canal supplying 

 a reservoir on Owl Creek, formed by a large earth dam from which 

 canal systems distribute the water to the irrigable lands. Since 

 former reports the distributaries have been extended to serve an 

 area of 78,000 acres, about half of which is producing crops. Cereals 

 predominate, including wheat, oats, corn, rye, and barley. Alfalfa 

 is generally grown, and potatoes and garden truck occupy small 

 tracts. 



STRAWBERRY VALLEY PROJECT, UTAH. 



This contemplates the irrigation of 50,000 acres east of Utah Lake. 

 Storage is provided by a dam on Strawberry River. By means of 

 a tunnel nearly 4 miles long the water is carried through the rim of 

 the Great Basin and delivered to Spanish Fork River. Here it is 

 turned into the canal system by means of a diversion dam. The main 

 canal serves also as a power conduit, supplying a hydroelectric 

 plant, built early in the construction work, to furnish power for 

 driving Strawberry tunnel. A permanent use of the power is 

 planned for pumping water to tracts inaccessible by gravity flow and 

 for drainage. Surplus power is now sold the towns of Payson, 

 Salem, and Spanish Fork. The canal construction has recently 

 been actively pushed and the project as a whole is regarded as 85 

 per cent completed, A number of old canals in the valley will be 

 supplied from the Government works, and the delivery of stored 

 water began in June, 1915. The principal products are alfalfa and 

 other hays, cereals, sugar beets, and vegetables. 



OKANOGAN PROJECT, WASHINGTON. 



In Okanogan County, Washington, the Reclamation Service has 

 built works to serve 10,000 acres of land along Okanogan River 

 within 50 miles of the Canadian border. Storage is provided in 

 Salmon Lake and by an earthen dam on Salmon River near the 

 town of Conconully. (PI. 12, fig. 2.) The water is turned into a 

 canal system about 12 miles below the Conconully Dam by means of 

 a weir across Salmon River. The gravity system was completed in 

 1910 and the water has been used by the farmers each year on an 

 increased acreage. The area irrigated has now reached about 8,000 



