520 ANNUAL REPORT SMITHSONIAN INSTITUTION, 1919. 
topography and rocky soil and can best. be restored to forest con- 
dition. 
The great bulk of the land west of the hundredth meridian which 
is not too high, cold, or rocky for agriculture is arid. Of this 
arid portion, over 15,000,000 acres have been placed under irri- 
gation by private or public enterprise, and in carrying out this work, 
of course, the more favorable opportunities for such irrigation have 
been developed. It will still be possible to add many million acres 
to the irrigated area and perhaps to double the area now irrigated, 
but this must generally be done at high cost, as the cheap opportuni- 
ties have been long since exhausted. There are remaining, however, 
many areas which can be irrigated within feasible costs and will 
develop values far in excess of the necessary expenditures. They 
will furnish healthful homes for settlers and will supply agricul- 
tural products and food resources in proximity to great mining and 
grazing resources, which will be made more valuable thereby. There 
is much room for wise and profitable activity in this line in most of 
the Western States, but the total areas that can be thus reclaimed 
are much less than those offering opportunities in the States farther 
east. : 
‘The following table summarizes the results of the investigations 
made in the western division: 
Projecis and extensions of projects investigated by the Reclamation. Service 
in the Western States. 
1 These estimates must be considered as merely preliminary and subject to change. 
2 Indian. 
3 Lands not classified; classification shown is assumed. 
4 No estimate. 
Trrigable acreage. Readiness 
State'and project. altitude. bent epee onctegee 
Public. | Private. | State. tion. 
Arizona: Feet. | Inches. 
Sani@arlogs <-so4: see. 2 40, 000 BOROOM | aocmemenit 1, 500 10 {$13,600,000 | Not ready. 
California: 
Imperial Valley......./:} 400,000 |....22.2.2)e..0- 2200 —200 3h | 52,000,000 | Ready. 
Palo Verdes. .5 2) aie be 405000) | eeee eee 250 3 5, 000, 000 | Not ready. 
Turlock-Modesto.......|---------- 260, 000 |..---.----- 95 12 | 5,000,000 Do. 
Rem PS RIVED ic eee ce eles cokes ses 400; G00 S.2er ers. 225 10 | 12,000, 000 Do. 
Orland extension....-...|-..----.-- 30,000 |--.-. 2-2. 245 18 2,500,000 | Ready. 
Dron, Cany Oss c ps 2. crs! greet Peers QIAO00 ee. 230 17 | 30,000,000 | Not ready. 
Cuyamaca, Water Co....|....-.-.-- Bia POU ya aeiceiae 400 12 (4) Do. 
Volcan Land & Water 
CoMpt att iss A ERO eee 324,600. f. 22-2522 500 15 ~@) Do. 
TOSS Vip Me yg ices kA on paces ce’ 517 800) | tes eck 4,400 122 | 1,100,000 Do. 
Colorado: 
Grand Valley...:-....-- 15, 000 LS SOO0" eee e2 he 4, 825 8 600, 000 | Ready. 
Grand Valley drainage .|..-.------ SO; O00 SELES. . 4, 650 8 1,200,000} Do. 
Orehard Mesavt- 3.5 ccc Bl pes sot <2 OOD Soe sae 4,750 8 800, 000 Do. 
Uncompahgre.......... 10, 000 OV, QU0!| Sseceeenee 5, 500 93 500, 000 Do. 
‘ 
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