Unlike the Johnsrud section, we have not observed northern pike in the Scotty 



Density/1000' (+95%CI) 



Density/1000' (+95%CI) 



250 



1989 1990 1991 1993 1996 1998 2000 2002 



1989 1990 1991 1993 1996 1998 2000 2002 



Figure 16. Estimated Rainbow trout densities for the Johnsrud (left) and Scotty Brown Bridge (right) sections, 

 1989-2002. 



Brown Bridge section in samples to date. 



Wales Creek Section 



In 2002, we established a new fish population survey site (the Wales Creek 

 section) in a middle reach of Blackfoot River between the North Fork Blackfoot River 

 and Nevada Creek (rm 60.0-66.2). This section of the Blackfoot River suffers from 

 impaired water quality (elevated levels of fine sediment, summer water temperatures, and 

 nutrient levels) and degraded tributaries (Pierce et al. 2001). 



In May 2002, trout species composition (% of total catch) in the Wales Creek 

 section was 82.9% brown trout (n=136), 9.1% rainbow trout (n=15), 6.1% WSCT (n=10) 

 and 1.8% bull trout (n=3). We estimated total trout density (> 6.0") for the Wales Creek 

 section at 12.7 fish /1 000'. Of this, the brown trout (> 6.0") point estimate was 10.1 

 fish/1000\ We did not attain density estimates for the other species due to low densities 

 and small sample size. Estimated total trout densities (>6.0") in the Wales Creek Section 

 are 86% lower than the nearest downstream survey section (Scotty Brown Bridge 

 Section). A comparison of estimated densities of salmonids in the three 2002 Blackfoot 

 River survey sections are displayed in Figure 3. 



31 



