. Water Supply and Irrigation Papers of the United States Geological Survey. about 70 miles. The principal tributaries are Birch, McKay, and Meachum drainage area measures 2,130 square miles at the mouth of theriver, 640 square miles at Pendleton, and 353 square miles at Gibbon. The mean annual rainfall ranges from about 30 inches on thesummit of the Blue Mountains to 9 inches at the mouth of the stream,being 14 inches at Pendleton and 25 inches at Weston on the dividebetween Umatilla and Walla Walla rivers. The headwater regionsof the stream are quite heavily forested, but downstre
. Water Supply and Irrigation Papers of the United States Geological Survey. about 70 miles. The principal tributaries are Birch, McKay, and Meachum drainage area measures 2,130 square miles at the mouth of theriver, 640 square miles at Pendleton, and 353 square miles at Gibbon. The mean annual rainfall ranges from about 30 inches on thesummit of the Blue Mountains to 9 inches at the mouth of the stream,being 14 inches at Pendleton and 25 inches at Weston on the dividebetween Umatilla and Walla Walla rivers. The headwater regionsof the stream are quite heavily forested, but downstream the forestsgive place to rolling table-lands devoted to the production of immediate valley of the river has been irrigated for many years,and the entire low-water flow of the stream is appropriated for irri-gation. The United States Reclamation Service has completed aproject to irrigate about 20,000 acres near Hermiston (PL VII, A).The soil of this portion of the drainage basin is sandy and the climatic U. S. GEOLOGICAL SURVEY WATER-SUPPLY PAPER 252 PLATE VII. A. FURNAS RANCH, NEAR HERMISTON, OREG., UMATILLA PROJECT.
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