.- action alternative. Mitigation 

 measures to prevent erosion and 

 sediment delivery would ensure no 

 change in nutrient levels would 

 occur. Therefore, no indirect 

 effects to the population levels 

 of sensitive plants are expected. 



Cumulative Impacts to Sensitive 

 Plants 



• Cumulative Impacts qfthe J\'o-Jlction and 

 Jlclion Jtltemative* to Sensitive I*lants 



If changes in water yield or 

 nutrient levels occur, sensitive 

 plant populations may, in turn, be 

 affected. Given the level of the 

 proposed and active harvesting on 

 Swan River State Forest and other 

 land in the project area, no 

 measurable changes in water yield 

 or surface water levels are 

 anticipated from the proposed 

 action alternative. The 

 application of mitigation measures 

 to prevent erosion and sediment 

 delivery would ensure that no 

 change in nutrient levels would 

 occur. 



NOXIOUS WEEDS 



Existing Condition 



Spotted knapweed (Centaurea 

 mauclosa) and common St. Johns-wort 

 {Hypercium perforatum) populations 

 have become established along road 

 edges within the project area. Swan 

 River State Forest has begun a 

 program to reduce the spread and 

 occurrence of noxious weeds . 



Direct and Indirect Impacts to 

 Noxious Weeds 



• Direct and Indirect Intpacts qfthe JWo-jlction 

 Jlltemative to JVoscious Weeds 



Noxious weed populations would 

 continue as they exist. Weed seed 

 would continue to be introduced by 

 recreational use of the forest and 

 logging activities on adjacent 

 ownerships . Swan River State 

 Forest may initiate spot spraying 

 under the FI program to reduce the 

 spread of noxious weeds along 

 roads . 



• Direct and Indirect Impacts ofUie Jlction 

 Jlltemative to JVtKcious Weeds 



Logging disturbance would provide 

 opportunities for noxious weeds to 

 establish; log trucks and 

 equipment would introduce seeds 

 from other sites. Occurrences and 

 the spread of noxious weeds would 

 be reduced by mitigation measures 

 designed to apply integrated weed- 

 management techniques. Grass 

 seeding of new and disturbed roads 

 and landings and spot spraying of 

 new infestations would reduce or 

 prevent the establishment of new 

 weed populations. Requiring 

 machinery to be washed and 

 inspected prior to entering the 

 project area would reduce the 

 introduction of noxious weed seeds 

 into the forest. Roadside 

 herbicide spraying would reduce 

 existing noxious weed populations. 

 All herbicide spraying would be 

 strictly controlled to follow 

 label directions, prevent 

 introduction of chemicals into 

 riparian systems, and target only 

 the intended noxious weed species. 



Cumulative Impacts to Noxious Weeds 



• Cumulative Impacts qfthe JWo-Jlction and 

 miction Mtematives to JWoadous Weeds 



This proposed action alternative, 

 together with other management and 

 recreational activities on Swan 

 River State Forest and adjacent 

 lands, would provide an 

 opportunity for the transfer of 

 weed seeds from various sites and 

 an increased establishment of 

 noxious weeds. Prevention actions 

 through the County Weed Board and 

 active weed-management activities 

 would be used to reduce the spread 

 and establishment of noxious weeds 

 and the resulting replacement of 

 natural vegetation. Swan River 

 State Forest would continue to 

 provide some level of weed 

 management through this action and 

 with other management programs. 



Big Blowdown Salvage 



Page C-15 



