202 BULLETIN Til, U. S. DEPARTMENT OF AGRICULTURE. 
The total cost of grading was classified as follows : 
Labor $8, 824. 05 
Powder 1, 247. 57 
Total (3.53 miles) 10,071.62 
The average cost per mile when based on 3.53 miles of actual 
grading was $2,853.00 ; when based on 4.75 miles, or the total length 
of the line, $2,120.34. The following wages were paid: Grading 
foreman, per day, $3.50 to $4; laborers, per day, $2. 
There were 1,450 feet of cribbing for stringer bridges built on 
ground that was soft during parts of the year. The conditions were 
ideal for this kind of work, since the timber was long, straight, 
second-growth fir. The mud sills were spaced about 20 feet apart. 
The stringers were not barked, neither were they hewn on top. 
The hill trestles, 15 in number, were frame-bent structures. In 
length they ranged from 48 to 224 feet; in height from 10 to 45 
feet, averaging about 20 feet. Their total length was 1,656 feet. 
The bents were spaced 16 feet apart center to center. Hewn caps 
and stringers were used. The caps were 12 feet long and hewn to 
a 12-inch face on two sides ; the stringers, 15 inches thick and hewn 
to an 8-inch face on two sides. The value of the stumpage included 
in these structures, as well as in other bridges, is not included in 
the cost. As these trestles were constructed on a steep side-hill, their 
cost was higher than it would have been on level ground. The cost 
was segregated as follows: 
Items. 
Total cost. 
Cost per 
linear foot. 
Labor 
Bracing, material 
Spikes and drift bolts 
Bridge tools 
Total 
S3, 567. 10 
378. 56 
229. 80 
448. 17 
4,623.63 
S2.15 
.228 
.132 
.270 
The cost of the trestle at the slough does not include laying the ties 
and steel. The following items were segregated : 
Items. 
Total cost. 
Cost per 
linear foot. 
Labor 
$2,187.00 
70.00 
122.00 
1,242.00 
84.00 
427.00 
SO. 63 
Bracing, material. . . . . 
.021 
Drift bolts 
.037 
.373 
Brow^skid straps ...... 
.025 
Tools 
.127 
Total ... 
4,132.00 
1.213 
The above includes the cost of building 3,300 feet of 3-pile bent 
trestle, together with a 300-foot log dump, the driving of the piling, 
