IRRIGATIOA 99 



Average annual rainfall on irrigable area for 25 years: 12 inches; 1912, 9.84 

 inches. 



Range of temperature on irrigable area: -40 to 100 degrees. 



Character of soil of irrigable area: Sandy loam clay, adobe and alluvium. 



Principal products: Hay, grain and vegetables. 



Principal markets: Great Falls, Helena and Butte, Montana. 



BLACKFOOT (INDIAN) PROJECT. 



Location. 



County: Teton. 



Townships: 31 to 34 North, Ranges 5 to 10 West; 29 North, Range 8 West; 

 30 North, Ranges 6 to 9 West; and 35 North, Ranges G to 7 West, Montana Meridian. 



Railroad: Great Northern. 



Railroad stations and estimated population: Browning, 250; Blackfoot, 50; Bom- 

 bay; Seville; Garnet; Glacier Park, 100; Cut Bank, 800. 



Water Supply. 



Source of water supply: Cut Bank, Two Medicine, Badger, Birch, Whitehall and 

 Blacktail Creeks. 



Area of drainage basins: 1,700 square miles. 



Annual run-off in acre-feet: Cut Bank Creek at Cut Banks (971 square miles), 

 190G to 1911— Maximum, 269,000; minimum, 142,000; mean, 200,000. Two Medicine 

 Creek at Family (368 square miles), 1907 to 1911— Mean, 341,000. Badger Creek at 

 Family (224 square miles), 1907 to 1911 — Mean, 191,000. Birch Creek at Dupuyer 

 (155 square miles), 1907 to 1911— Mean, 116,000. 



Data for Complete Project. 



Reservoirs: Two Medicine Lake — Area, 854 acres; capacity, 16,000 acre-feet; 

 length of spillway, 5G feet; elevation of spillway, 25i/4 feet above stream bed. Spring 

 Lake — Area, 1,400 acres; capacity, 29,000 acre-feet; length of spillway, 50 feet; 

 elevation of spillway, 455 feet above stream bed. Four Horns — Area, 1,867 acres; 

 capacity, 60,640 acre-feet; length of spillway, 50 feet; elevation of spillway, 57 feet 

 above stream bed. 



Storage dams: Two Medicine Lake — Type, earth embankment with rock-filled 

 log crib and re-enforced concrete controlling works; maximum height, 3G feet; length 

 of crest, 900 feet. Spring Lake — Type, earth fill; maximum height, 50 feet; length 

 of crest, 1,500 feet; volume, 75,000 cubic yards. Four Horns — Type, earth fill; maxi- 

 mum bight, 62 feet; height of crest, 2,225 feet; volume, 149,000 cubic yards. 



Diversion dams: For Badger, Birch and Cut Bank Creeks, not designed. Two 

 Medicine — Type, brush and rock; maximum height, 4 feet; length of weir, 165 feet; 

 length of earth fill, 1,000 feet. 



Length of canals: 40 miles, with capacities greater than 300 second-feet; 144 

 miles, with capacities from 50 to 300 second feet; 600 miles, with capacities less than 

 50 second-feet. 



Dikes: Aggregate length, 800 feet. 



Irrigable area: Entire project, 122,500 acres: Two Medicine Unit, 48,000 acres; 

 Badger Unit, 33,000 acres; Cut Bank and Carlow Units, 38,000 acres; Birch Unit. 

 3,500 acres. 



Present status of irrigable land: AH lands on Indian reservation principally 

 allotted to Indians. 



Results to June 30, 1913. 



Canals: 62 miles, with capacities from 50 to 300 second-feet; 154 miles with 

 capacities less than 50 second-feet. 



Canal structures: Costing over $2,000 each: Concrete, 3; wood, 1. Costing 

 from $500 to $2,000 each: Concrete, 5; wood, 7. Costing from $100 to $500 each: 

 Concrete, 16; wood, G. Costing less than $100 each: Concrete, 83; wood, 1,064. 



Bridges: Wood, 1, more than 50 feet in length; 33, less than 50 feet in length; 

 total length, 733 feet. 



Culverts: Concrete, 13; length, 1,142 feet. Wood, 87; length, 5,629 feet. 



Pipe laid: Concrete, 2,687 feet; steel (corrugated), 1,346 feet. 



Flumes: Steel, 2; length, 800 feet. Wood, 3; length, 503 feet. 



Buildings: Offices, 1; residences, 1; barns and storehouses, 2. 



Wells, 6; aggregate depth, 184 feet. 



Roads: 7 miles. 



Telephone lines: 109 miles. Telephones in use, 11. 



Material excavated: Class 1, earth, 1,357,736 cubic yards; class 2, undurated 

 material, 38,168 cubic yards; class 3, i-ock, 79,817 cubic yards. 



Riprap: 550 cubic yards. 



— A vast acerage of Montana stump land awaits clearing and cultivation. 



