36 



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



Second cutting cycle. — Volume remaining after 70 iK-r cent cut in first cutting 

 cycle is 14<).691.(XX) feet, on 109,838 acres. 



Increment on above stand at an avmiiie rate of I.IO" hoard feet i)er acre per 

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



Total volume from which to obtain second cut is (J17,;}40,500 b. m. 



Expectetl yield (70 per cent cut) 432,138,850 feet b. m. 



Third cuttini; riich-. — Tliis cut will come from an area of 28,000 acres of 

 present i)ole 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 579,520,500 feet (even allowing a 50 per 

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

 should al.so 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 lisrures that are at best only 

 ai)proximately accurate, these checks show that there is no danger of a hiatus 

 as the result of the use of the sustainetl yield figure of 7.(X)0,000 feet annually 

 during the fir.st cutting cycle. 



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



First cycle, 1921 to 10.">r). Inclusivo. 

 Second cycle, 1956 to 1990, Inclusive. 

 Third cycle, 1991 to 2025, Inclusive. 

 Fourth cycle, 2020 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] 



Forest-produdng area 



Volume, trees over 

 10 inches d. b. h. 



Ulock name 



Inac- 



1-20 

 repro- 



cessiDie ductlon 



Aerei 



Willow 1.4 



French Creek. ! 385.0 



lUiRtown ' 



Upper Hell Canyon 



Lower Hell Canyon • 



Pass Creek • 



IlawkwriKht • ■ 



Pleasant Valley • ' 



Cold Brook.. 



Mayo 7.4 



Hasclrodt.. 



Flynn Creek 



Wind Wave 



Total 398.8 



Acres 



1, 930. 5 



1,314.6 



1, 533. 9 



4, 822. 8 



2,36a0 



1,044.0 



345.4 



4,761.8 



3,205.7 



1,818.0 



771.4 



137.9 



6, 350. 



20-80 

 pole 

 stand 



.4crM 

 1, 275. 5 



902.2 

 3,204.5 

 9,511.9 

 3,534.4 

 1,776.2 



680.4 

 4,157.5 

 1,323.9 



741.0 



372.0 

 61.7 



460.3 



80 xrer- 

 chantable 



.4crM 

 9,090.8 

 9, 602. 3 

 2. 34.3. G 

 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 

 area 



Acta 



12,305.8 



11,819.1 



7,082.0 



17,028.6 



27, 152. 2 



5, 724. 1 



2,783.8 



35, 031. 2 



11,811.4 



10, 385. 



7,238.6 



3,332.1 



16,666.3 



29,411.6 ' 28,008.1 109,838.4 167,258.1 468,069.6 801.8 



Accessible 



M.bd.ft. 



88,746.8 



41,349.0 



8,641.2 



7,966.9 



56, 949. 8 



5,229.6 



3,622.0 



121,734.6 



27,667.6 



44,969.2 



40,432.4 



20, 973. 8 



50,797.8 



Inac- 

 cessible 



M.bd.ft. 



6.6 



746.0 



49.3 



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



* Johnson's flRures Indicate that the average annual Increment per acre for the first 20 

 years after cutting Is slightly over 168 fe«*t b. m. In order to be conservative for the 

 3.') yi-ar pt-rioU. lOO fici pi'i acre is adopted In ri . 



