ae 
IRRIGATION EXPERIMENTS IN IDAHO. 45 
‘south side of Snake River in Twin Falls County. Of the Boise 
Valley canals the Riverside, Farmers’ Cooperative, Farmers’ Union, 
and Settlers’ irrigate clay loam bench soils almost exclusively, while 
the Boise Valley, Pioneer, and Eureka irrigate the more porous 
sandy loam and gravelly bottom soils. The ground water usually 
lies rather close to the surface under the lands irrigated by the 
bottom canals. The Randall and the Clark and Edwards canals 
irrigate very gravelly soil in the upper Snake River Valley, the gravel 
being of a very porous nature to a depth of at least 80 feet, at which 
depth the ground water is found. The South Side Twin Falls Canal 
irrigates approximately 200,000 acres of gently rolling clay loam soils 
with an average slope of about 50 feet per mile, the soil underlain 
with lava rock and ranging from 2 to 40 feet in depth, with a probable 
average of 8 feet. The data secured from these canal systems during 
the Idaho investigation are shown in a condensed form in tables 
XXII and XXIII, which follow. The volumes diverted by the canals 
during the season of 1911 were measured by W. G. Steward, of the 
United States Reclamation Service, and the remainder of the data 
was secured by our own assistants. 
Table XXII shows areas devoted to different crops under the 
canals investigated: 
34 . . . 
 TasLE XXII.—Acreage devoted to different crops, and percentage of areas actually wrri- 
e gated under ten different canals. 
Hay. Pasture. Grain. Orchard.1! 
Name of canal. | Year. ; S 5 Total. 
er ‘ Per er : Per 
Acres. conte Acres Cant Acres Pont Acres. aah. 
Riverside......... 1911 4,059.00 | 54.7 755 745) 2.4 911.00 | 12.2 | 2,280.25 | 30.7 7, 425. 50 
DO. eae 1912 | 3,455.75 | 50.1] 627.25] 9.1] 1,360.00 | 19.7 | 1,455.50 | 21.1 | 6,898.50 
Farmers’ Coopera- 
(HN) 5 See 1911 5,526.75 | 44.4 | 1,626.00 | 13.1 2,043.50 | 16.4 | 3,239.00 | 26.1 | 12,435.25 
DOs, See 1912 | 4,890.00 | 37.4 | 2,289.50 | 17.5 | 2,354.25 | 18.0 | 3,528.66 | 27.1 | 13,062.41 
Farmers’ Union...| 1911 3,339.44 | 48.8 | 1,171.94 | 17.1 1,526.94 | 22.3 804.38 | 11.8 6, 842.70 
Da: 1912 | 3,045.35 | 42.6 | 1:534.74 |-21.5 | 1,737.00 | 24.3] 827.33] 11.6.) 7,144.42 
Settlers’........... 1911 | 4,385.25 | 37.1 | 2,157.25 | 18.2 | 3,686.50 | 31.2 | 1,590.80 | 13.5 | 11,819.80 
i IDO 3 Se eee 1912 4,490.25 | 38.2 | 1,848.20 | 15.7 3,294.75 | 28.0 | 2,121.80 | 18.1 | 11,755.00 
Boise Valley.....- 1911 332.25 | 14.9 | 1,189.09 | 53.4 Zils S0) | l255 426.35 | 19.2 2,225.49 
IDOsse sen eae 1912 267.00 | 11.7 | 1,222.50 | 53.4 336.00 | 14.7 461.50 | 20.2 2, 287.00 
Eureka... eee OL 369.00 | 17.9 | 1,138.75 | 55.2 505.00 | 24.5 49.25 2.4 2,062.00 
Pioneer......... .-| 1911 15S 25) | LOS, 667.67 | 59.3 197.90 | 17.6 4 || IPD) 1,126.54 
DOS eee 1912 132.50 | 11.5 689.32 | 60.0 166.75 | 14.5 160.17 | 14.0 1,148. 74 
mvandall:: . 206... - 1912 1,193.50 | 36.6 207.50 6.4 1, 145.00 | 35. 2 709.00 | 21.8 3, 255. 00 
Clark and Edwards} 1912 570.00 | 41.9 97.00 (eal 463.50 | 34.0 232.00 | 17.0 1,362. 50 
South Side Twin 
Balisee 1912 | 59,229.00 | 40.2 10,094.00 | 6.8 | 56,379.00 | 38.3 |21,607.00 | 14.7 |147,309.00 
Donets... 1913 | 54,903.00 | 36-8 [12,212.00 | 8.2 | 60,805.00 | 40.7 [21,391.00 | 14.3 149, 311.00 
PRotalmesaeee chin. 8. 15053035201 |esa oe 38, 947..96-|..---. 137, 189989) |e. 61029571) |b sexe I387, 470. 85 
Average per 
GGIN Rs Cob SHlbSaeee Gece eee Sionisial Weaeer aan lO Rast S SO Aa ee eee es 15.7 100. 00 
1 Includes small fruits, garden, potatoes, and home grounds. 
Table XXII includes no uncleared land, but only the areas actually 
‘urigated under each canal system investigated, and shows that 38.8 
per cent of the area was devoted to hay, 10.1 per cent to pasture, 
30.4 per cent to grain, and 15.7 per cent to orchard and miscellaneous 
