36 



MISC. PUBLICATION 11, U. S. DEPT. OF AGEICULTURE 



Second cutting cycle. — Volume remaining after 70 per cent cut in first cutting 

 cycle is 140,691,000 feet, on 109,838 acres. 



Increment on above stand at an average rate of 150 " board feet per acre per 

 year is 476,649,500 feet b. m. 



Total volume from which to obtain second cut is 617,340,500 b. m. 



Expected yield (70 per cent cut) 432,138,350 feet b. m. 



Third cutting cycle. — This cut \Yiil come from an area of 28,000 acres of 

 present pole stands and from 82,378 acres of the area now bearing merchant- 

 able timber and poles. This gives a total area of 110,386 acres. There should 

 be a volume of accrued increment of 579,526,500 feet (even allowing a 50 per 

 cent loss for death and decay on the area of the present pole stands). There 

 should also be thinnings from other stands. 



Fourth cutting cycle. — This cut will come from 29,412 acres now in repro- 

 duction and from an additional area of 82,378 acres now bearing reproduction 

 and poles under mature timber. 



Total area to be cut over in fourth cycle is 111,790 acres. This should furnish 

 a cut at least equal to that obtained in the third cutting cycle. 



While the estimates of future yield are based on figures that are at best only 

 approximately accurate, these checks show that there is no danger of a hiatus 

 as the result of the use of the sustained yield figure of 7,000,000 feet annually 

 during the first cutting cycle. 



The cutting cycles will include the following years during the first rotation: 



First cycle, 1921 to 1955, inclusive. 

 Second cycle, 1956 to 1990, Inclusive. 

 Third cycle, 1991 to 2025, inclusive. 

 Fourth cycle, 2026 to 2060, Inclusive. 



Table 1. — Areas and volumes for Custer working circle 



[The following area and volume table has been taken from the best available data. The figures for volume 

 are for western yellow pine, the only merchantable species] 



Block name 



Willow 



French Creek 



Bugtown 



Upper Hell Canyon 



Lower Hell Canyon <» 



Pass Creek <» 



Hawkwright » 



Pleasant Valley <» 



Cold Brook 



Mayo 



Haselrodt 



Flynn Creek 



Wind Wave 



Forest-producing area 



Inac- 



Acres 



1.4 



385.0 



7.4 



Total. 



1-20 

 repro- 

 duction 



Acres 



1,939.6 



1,314.6 



1, 633. 9 



4, 822. 8 



2, 360. 



1, 044. 6 



345.4 



4, 761. 8 



3, 205. 7 



1,818.0 



771.4 



137.9 



5, 356. 



29, 411. 6 



20-80 

 pole 

 stand 



Acres 



1. 276. 5 

 902.2 



3. 204. 6 

 9, 511. 9 

 3, 534. 4 

 1, 776. 2 



4 

 5 



157. 



741. 6 i 

 372. I 

 61.7 i 



»u mer- 

 chantable 



Acres 

 9, 090. 8 



9. 602. 3 

 2, 343. 6 

 2, 691. 8 



21, 257. 8 

 2, 903. 3 

 1,758.0 



26, 111. 9 

 7, 281. 8 



7. 825. 4 

 6, 095. 2 

 3, 132. 5 

 9, 744. 



Total 

 forest- 

 producing 



Acres 



12,305.8 



11,819.1 



7,082.0 



17, 026. 6 



27, 152. 2 



5, 724. 1 



2, 783. 8 



35, 031. 2 



11,811.4 



10, 385. 



7, 238. 6 



3, 332. 1 



15, 566. 3 



Volume, trees over 

 10 inches d, b.fh. 



Accessible 



Inac- 



28, 008. 1 I 109, 838. 4 167, 258. 1 468, 969. 5 j 801. 8 



M.M.ft. 



38, 746. 8 



41, 249. 



8, 641. 2 



7, 966. 9 



56, 949. 8 



5, 229. 6 



3, 622. 



121, 734. 5 



27, 657. 5 



44, 969. 2 



40,432.4 



20, 973. 8 



50,797.8 ! 



M.bd.fi. 



6.5 



746. 



3.3 



» Data not based on timber surveys. Figures only approximate. 



5 Johnson's figures indicate that the average annual increment per acre for the first 20 

 years after cutting is slightly over 168 feet b. m. In order to be conservative for the 



35-year period, 150 feet per acre is adopted here. 



