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<br />n8nssn <br /> <br />. <br /> <br />. <br /> <br />PARTVL IRRIGATED AREAS <br /> <br />. <br /> <br />hrigated areas in the San Juan and Navajo river basins were identified <br /> <br /> <br />through inspection of aerial photographs obtained from the Water Commissioner <br /> <br />for Districts 29 and 77. The photographs are from the U.S. Department of Agri- <br /> <br /> <br />culture-Agriculture Stabilization and Conservation Service (ASCS), and were <br /> <br /> <br />flown primarily in 1956 and 1960. The photograph scales vary, but are approxi- <br /> <br /> <br />mately I inch to 660 feet. In areas not covered by the aerial photography, ortho- <br /> <br /> <br />photoquads obtained from the U.S. Geological Survey were used to identify <br /> <br /> <br />irrigated areas. Total irrigated acreages obtained from the photos and quads <br /> <br /> <br />were verified with totals obtained from the Water Commissioner for each river <br /> <br /> <br />reach or tributary of the San Juan River. Approximately 13,100 acres are irri- <br /> <br /> <br />gated in the San Juan River basin upstream of, Navajo Reservoir. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />A summary of irrigated areas for each river or tributary of the San Juan <br /> <br /> <br />River is listed in Table 3. The acreages included some timber and range areas <br /> <br /> <br />that receive irrigation water on a periodic basis for the improvement of range <br /> <br /> <br />pasture grass. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />-14- <br /> <br />. <br /> <br />-,j; ,',,", <br />