202 BITLLETIN 711, U. S. DEPARTMENT OF AGRICULTURE. 



The total cost of grading \\as classified as follows: 



Labor $S, 824. 05 



Powder 1, 247. 57 



Total (3.53 miles) 10, 07L 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 



$3, 567. 10 

 378. 56 

 229. 80 

 448. 17 



$2.15 

 .228 

 .132 

 .270 



4,623.63 



2.78 



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. 





S2, 187. 00 



70.00 



122.00 



1,242.00 



84.00 



427.00 



$0.63 



■Rrar.ing, matprial 



.021 



Drift bolts.. . . . 



.037 



Piling, caps, and stringers 



.373 



BroWskid 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, 



