250 



^ 200 



150 



30 Measured 

 Single Reference 



Fish Populations and other Monitoring Activities 



In order to establish a pre-restoration baseline, we inventoried fish populations, 

 measure water temperatures, discharge and aspects of channel morphology in Hoyt 

 Creek. 



Fish population surveys, completed at four locations in 2005, recorded low 

 densities of primarily brook trout, except downstream of the spring where densities were 

 significantly higher. Brown trout are also present in lower Hoyt Creek (Figure 22). 



We measured stream discharge at three locations: 1) 0.30 cfs in the small spring 

 creek to lower Hoyt Creek; 2) 0.38 cfs in lower Hoyt Creek immediately upstream of the 

 spring creek confluence; and 4) 0.30 cfs upstream the project area and all diversions at 

 mile 4.0. All irrigation was shut off during these surveys. 



Water temperature sensors recorded a high of 64.9 °F upstream of the project 

 (mile 4.3) compared to 74.6 °F downstream of the proposed project (mile 1.2) (Appendix 

 H). We used a 

 "cumulative bankfiill 

 width" survey to 

 calculate channel 

 width characteristics 

 of lower Hoyt Creek 

 upstream of the 

 spring. The survey is 

 based on a stable (i.e. 

 reference E-type) 

 bankfiill width and 

 involves a systematic 

 upstream survey of 30 

 bankfiill widths at 10' 

 intervals beginning at 

 the "reference" cross- 

 section width. This 



survey indicates the existing lower Hoyt Creek channel has a cumulative bankfiill width 

 approximately 50% wider than the cumulative reference condition (Figure 23). Based on 

 observations, this widening is a fiinction of hoof-shear damage. 



Jacobsen Spring Creek 



Restoration objectives: Maximize secondary instream productivity; maximize quality of 

 shoreline rearing areas; restore spawning site potential by reducing levels of fine 

 sediment in riffles to a level suitable for maximum spawning; reduce summer water 

 temperatures suitable for bull trout use (<60 °F); provide high quality pools with a high 

 level of complex cover; maximize use of existing channel belt width and existing 

 shoreline areas. 



•o 

 o 



I 100 



3 



E 



3 



u 



50 



11 16 



# of Channel widths 



21 



26 



Figure 23. Cumulative bankfiill width relationship for a reference and 30 

 measured channel widths. 



Description 



34 



