Approximately 313 acres in the West Fork of Ashby recently burned. Most of 

 the bum severity was a mosaic fire, with a portion of the State Trust Lands, 

 resulting in a stand replacement conditions. 



Since 1974, approximately 4260 acres have been harvested in the Ashby 

 Creek, between State and Plum Creek ownership. Harvest Levels in the 

 watershed are high. The upper portion of the watershed has had extensive 

 harvest. The mid to lower portion of the watershed has been extensively 

 harvested and heavily grazed. 



Existing water yield increases are approximately 20.2% or 1301 acre feet. 

 Post fire water yield increased to approximately 25.3%. 



The existing water yield in Ashby Creek has exceeded the allowable water 

 yield increase of 15%. Existing water yield increases are high and have 

 resulted in increased channel instability and increased sediment yields. 

 Anticipated water yield increases due to wildfire are expected to increase 

 erosion on steeper slopes and existing roads in the burned area. 



Wallace Creek 



Past and ongoing management activities within the affected watershed include 



fire, timber harvest, road maintenance and use, grazing, mining and 



recreation. 



Approximately 323 acres in the Wallace Creek recently burned. Most of the 



bum severity was a mosaic fire, with a portion of the State Tmst Lands, 



resulting in stand replacement conditions. 



Existing harvest levels in the Wallace Creek watershed are moderate. Since 



1962, approximately 3282 acres have been harvested in Wallace Creek 



between State, BLM and Plum Creek ownership. The mid to lower portion of 



the watershed does have historic and current mining claims. 



Existing water yield increases are approximately 5.9% or 688 acre feet. Post 

 fire water yield increased to approximately 8.8%. 



Dirty Ike Salvage Environmental Assessment 



3-8 



