2, BULLETIN 1421, U. S. DEPARTMENT OF AGRICULTURE 
during the last quarter of a century as well as by the possibility of 
further growth in the future. In round figures the irrigated area 
ot the State increased from 609,000 acres in 1900 to 2,489,000 acres 
in 1920 (figs. 1 and 2). Of the total acreage of improved land in 
IDAHO 
Relief Map 
Fic. 1.—A large portion of the State of Idaho is rough and mountainous. Of the total 
area of the State, less than 16 per cent was in farms and less than 9 per cent was 
improved land in 1919. Ofthe total acreage in farms that year, only 54 per cent was 
improved land. (Map from the School of Mines, University of Idaho) 
farms, 55 per cent was irrigated in 1920. In addition there still 
remain large areas of arid sagebrush land that is well adapted to 
puleneed farming, for which water will doubtless be provided in the _ 
uture. 
