o 

 o 



2.5 



1.5 



u 

 O 





0.5 



Jacobsen Spring Creek(s), a series of two small, inter-connected spring creeks 

 totaling 13,700' in length, merge at stream mile 0.7 and enter the North Fork of the 

 Blackfoot River at mile ~4.0 with a base flow of ~4-7 cfs (Appendix D). Based on 

 landowner accounts, the spring creek system was a historical bull trout and WSCT 

 stream. Jacobsen Spring Creek is now highly degraded and currently supports low 

 densities of brown trout, brook trout and rainbow trout, based on FWP fish population 

 surveys completed in 

 2004 and 2005 (Appendix 

 A). Currently, the stream 

 maintains low sinuosity 

 and is over-widened 

 approaching maximimi 

 widths of -50' (Table 2). 



Despite a 



degraded condition, the 

 spring creek appears to 

 posses the basic habitat 

 components necessary for 

 improved fisheries, 



including bull trout use. 

 These include cold groundwater input, sufficient base flows, a gravel base and a 

 surrounding spruce forest that will provide shade, complexity and the input of wood to 

 the channel. Current habitat impairments on the spring creek include areas of livestock- 

 induced channel degradation and suppressed riparian vegetation, which has resulted in 

 charmel over-widening, elevated temperatures and excessive sediment input and 

 accumulation. Historical timber harvest contributes to reductions of instream wood, 

 further contributing to the channel measurements 



Mile 0.1 



Mile 0.6 Mile 1.1 



Mile 1.4 



Figure 24. CPUE for trout at four sites in 

 Jacobsen Spring Creek, 2004. 



simplification of habitat. 



The initial phases 

 of channel restoration, 

 including 5,800' of 

 reconstruction, began in 

 2005 and will continue 

 through 2006. The goal 

 of the project is to restore 

 a high quality spring 

 creek capable of self- 

 maintaining complex 

 habitat suitable to all 

 salmonids in the North 

 Fork Blackfoot River. 

 Phase two of this project, 

 slated for 2006, includes 

 another 7,900' of channel 

 work. When completed, 

 this project will narrow and deepen the charmel, increase stream sinuosity, place instream 



Stream channel length 



Sinuosity 



Total # Pools 



# Sampled Pools 

 Pool Frequency 



# Pools Measured with LWD 

 Pool Length 



Wetted Pool Surface Area 



Maxim Pool Depth 



Wetted Pool Width @ Max Depth 



Wetted Width @ Riffle Crest 



Bankfull Width @ Max Pool Depth 



Bankfull Width @ Riffle Crest 



Riffle Crest Depth 



Residual Pool Depth 



3150 



1.37 



19 



10 



6.0/1000' 



9(90%) 



37±21(14-79) 



858±626(224-1859) 



1.7±0.7(0.9-3.3) 



20±1 0(9-44) 



24±1 2(8-47) 



21 ±10(9-44) 



24±12(8-47) 



0.6±0.2(0.4-0.9) 



1.1±0.7(0.3-2.7) 



all in standard (ft) units 



Table 2. Summary of pre-proj'ect channel measurements for the 

 lower reach of Jacobsen Spring Creek. 



35 



