Large old growth occurs on better sites and usu- 
ally at lower elevations than the smaller type. 
Small old growth is common in the Cascade Range 
of Oregon but seldom occurs in the Coast Range 
except in southern Oregon. It is found along the 
west shores of Puget Sound and on Hood Canal, a 
district of comparatively low precipitation and 
gravelly soil. 
A very large proportion of the original area of 
large old growth was privately owned, and after 
three decades of large-scale logging about two- 
thirds of the present area is privately owned. 
Most of the small old growth is on national-forest 
land, little of which has been cut over. 
DOUGLAS-FIR SECOND-GROWTH SAW TIMBER 
About 28 percent of the total Douglas-fir saw- 
timber type area is occupied by second growth 
(type 8), nearly three-quarters of it in western 
Oregon. 
Second-growth saw-timber stands are nearly all 
even-aged. Most of them range from about 90 to 
160 years. On the better sites and in the more open 
stands Douglas-fir trees reach a breast-high diam- 
eter of 20 inches as young as 60 years and 40 inches 
by 120 years. Asa general rule, however, Douglas- 
fir even on sites I and II does not attain a 40-inch 
d. b. h. if the stand is closed until it reaches the age 
of 150 years, after which growth slows down. 
These stands occur chiefly on old burns. They 
are usually pure averaging for the region as a 
whole between 85 and 90 percent Douglas-fir. 
Volume per acre ranges from 10,000 to 125,000 
board feet and averages about 45,000 feet. A very 
considerable amount of logging is taking place in 
this type, principally to supply logs to small mills 
TYPE CLASS NATIONAL ALL 
AND SPECIES PRIVATE FOREST OTHER 
SAW-TIMBER TYPES 
Oa’! !2' 2a’ a’ aa"! Oe yy 
DOUGLAS -FIR penne, § WI) 
PULP SPECIES Reeeeeeeeeteeernes ZG 
OTHER SPECIES iy Z 
SECOND-GROWTH TYPES 
DOUGLAS -FIR Rese WZ. 
xX 
PULP SPECIES MY A 
| 
OTHER SPECIES j A 
Oo te a ee a ig a ae a one eee 
MILLIONS OF ACRES 
Figure 7.—Areas of saw-timber and second-growth types in the Douglas-fir region, by ownership class, 
