f 



HARVEST-VOLUME 

 EFFECTS RELATED TO 

 FUTURE GROWTH AND 

 YIELD 



;i NO-ACTION ALTERNATIVE 





til. Given the current estimated standing volume 

 L of 35.8 MMBF, an assumed estimated net 

 ii board feet growth rate of 1.3575% (assuming 

 no catastrophic events), and the current har- 

 vest level of zero, the standing timber volume 

 wrould be in the 41 MMBF range within 10 

 years. The No- Action Alternative would 

 result in the continuation of an increase in 

 volume in the Beaver Lake area. The defect in 

 .^ grand fir and some Douglas-fir would increase 

 over time, thus reducing the future value. The 

 trust has already lost value in some of the 

 stands by not harvesting lodgepole pine that 



rwas killed by mountain pine beetles in the late 

 1980s and early 1990s. , 



I ^ 



L ACTION ALTERNATIVES A AND B 



Using the most current stand-level inventory, 

 the net area available for timber management 

 in the project area is 3,405 acres. If we assume 

 a 10-year reentry period, this yields a harvest 



,j of 4,518 MBF per decade. Given the estimated 

 current standing volume of 35.8 MMBF, an 

 assumed estimated net board-feet growth rate 

 of 1.3575% (assuming no catastrophic events), 



^' and the current harvest level of 4,518 MBF per 



"^ decade, the standing timber volume would 

 once again be in the 35.8 MMBF range within 

 10 years. This calculation is based on the 

 following: the residual inventory (after har- 



I vesting) equals the current estimated inven- 

 tory (based on the current SLI) minus the 

 estimated harvest volume (35.8 MMBF - 4.518 

 MMBF = 31.282 MMBF); the resulting inven- 

 tory is projected into the future 10 years based 

 on the estimated growth rate of 1.3575% 

 (31.282 * 1.01375^ 10 = 35.798 MMBF). 



The average growth rate from State lands, 

 based on Forest Statistics for the Land Outside 

 National Forests in Northwest Montana. 1989 



publication (Collins and Cormer 1989) is 

 1.72%. The 1.36% is in the range of what 

 would be expected from State lands in north- 

 western Montana. There is a net annual 

 growth of total softwood sawtimber (Scribner 

 rule) of 38,245 MBF (Collins and Conner 1989, 

 Table 28 - State column) and a growing stock 

 net volume of sawtimber (Scribner rule) of 

 2,215,703 MBF (CoUins and Conner 1989, Table 

 18 - State Column). The % net growth in board 

 feet is equal to 100 times the net growth in 

 board feet divided by the total inventory in 

 board feet or (100*38,245/2,215,703). 



EFFECTS OF ROAD PLAN 

 ON TIMBER 

 MANAGEMENT 



NO-ACTION ALTERNATIVE 



The road would remain in its current condi- 

 tion and would need to be upgraded before it 

 could be used for any extensive timber-har- 

 vesting proposal. 



ACTION ALTERNATIVES A AND B 



Either of the alternative road networks would 

 meet timber management needs of the pro- 

 posed Beaver Lake timber sales. For future 

 timber-management implications, see the 

 Transportation section in Chapter IV. 



POTENTIAL EASEMENT 

 REVENUE 



The estimated total revenue from easements is 

 found in the following table. These estimates 

 are based on the current method for estimating 

 the easement value, which are derived from 

 the percentage of ownership by tributary, 

 value of the road (existing, plus improvement 

 from this proposed project), and the value of 

 land that is under the road. Figure IV-1 - 

 Tributary Areas for Transportation displays the 2 

 main tributary areas, colored blue and or- 

 ange/pink. The traffic flow in the blue tiibu- 

 tary area would be on South Beaver Road; 

 most of the traffic flow in the orange/pink 



n-\]V-32r 



Stillwater State Forest • Beaver Lake Timber Sale Project 



