Report of A. H. Carson. 41 



greater precipitation always takes place west of the Coast Eange, 

 with a less precipitation between the Coast and Cascade Ranges. 

 East of the Cascade Range the annual precipitation is small, in 

 fact so small that all of that subdivision of the State east of the 

 Cascades is called the arid section of the State. 



To better comprehend the part tliese mountain ranges play in 

 the annual distrilnition of moisture, I submit the following average 

 annual precipitation at the United States Weather Bureau stations 

 in the seven counties of the Third District, and the average pre- 

 cipitation for the months of June, July and August, to-wit: 



WEST OF THE COAST RANGE. 



Indies. 

 Coos County, annual precipitation 72.32 



Total for June, July and August 2.56 



Douglas County, at Gardiner, annual jsrecipitation 80.05 



Total for June, July and August 4.05 



EAST OF THE COAST RANGE. 



Douglas County, at Eoseburg, annual precipitation 35.16 



Total for June, July and August 1.98 



Josephine County, at Grants Pass, annual precipitation 33.86 



Total for .June, .July and August 1.34 



Jackson County, at Jacksonville, annual precipitation 27.03 



Total for June, July and August 1.65 



EAST OF THE CASCADE RANGE. 



Klamath County, at Klamath Falls, annual precipitation 14.35 



Total for .June, .July and August 1.54 



Lake County, at Lakeview, annual precipitation 16.73 



Total for .June, .July and August 1.69 



Lake County, at Silver Lake, annual precipitation 10.06 



It will be noted that at Gardiner, in Douglas County, the annual 

 precipitation is 80.05 inches, and the average for June, July and 

 August, 4.05. At Roseburg, in the same county, the annual pre- 

 cipitation is only 35.16 inches, while the average for June, July 

 and August is 1.98 inches. Gardiner is but a few miles from the 

 ocean, on Winchester Bav. The Coast Range at Gardiner closes 

 in, high and abrupt, and those hish mountains rapidly condense 

 the moisture from the clouds. Roseburg, being east of the Coast 

 Range, only gets the moisture that failed to condense on the west 

 side of the range during the rain storms of a season. 



As the moisture-laden atmosphere blows in from the ocean, the 

 Coast Range condenses much of it; that which escapes condensation 

 passes over the Coast Range and precipitates between the Coast and 

 Cascade Ranges. By the time the moisture-laden air passes over 

 the Cascade Range its moisture has lessened, hence the light annual 

 precipitation in Klamath and Lake Counties. 



^\Tlen the annual precipitation is normal, crops of all kinds 

 mature on any of the deep soils l)etween the Coast and Cascade 



