The highest density of brown trout YOY (4.58/10 ft) occurred 

 near an area of concentrated brown trout spawning activity 

 located below Poorman creek (RM 108) (Figure 14). The density of 

 brown trout YOY gradually decreased downstream from this spawning 

 area. The average brown trout YOY density was 1.66/10 ft at six 

 sampling locations in this reach. 



Reach 3 : Nevada Creek to Monture Creek 



Trout YOY were sampled at sixteen locations in reach 3. 

 Brown trout YOY were captured at all but one sampling station, 

 and averaged 0.48/10 ft in this reach. 



Rainbow trout YOY were observed in three sampling locations 

 of this reach (Figure 14) . Three stations near the mouth of the 

 North Fork of the Blackfoot River (RM 54.1) were the only 

 locations rainbow trout YOY were observed in reach 3, indicating 

 that this stream provides at least a limited source of rainbow 

 trout recruitment to the main river. Rainbow trout YOY density 

 in this reach averaged 0.03/10 ft. 



The North Fork of the Blackfoot River at RM 2.0 (Harry 

 Morgan FAS) had YOY rainbow and brown trout densities of 0.78 and 

 0.11 fish/10 ft respectively. 



No bull or cutthroat trout YOY were observed in Reach 3. 



Reach 4: Monture Creek to Belmont Creek 



Trout YOY densities were sampled at eight stations in reach 

 4. Species composition of YOY abruptly changes below the mouth 

 of Monture Creek as rainbow trout become the dominant species in 

 the Blackfoot River trout fishery. 



The highest rainbow trout YOY density (2.86/10 ft) observed 

 in the Blackfoot River was just below the mouth of Monture Creek 

 (Figure 14). Brown trout YOY density also increased in the upper 

 segment of this reach, indicating that observed spawning activity 

 in Cottonwood Creek and suspected spawning use of Monture Creek 

 results in recruitment of brown trout to the main river. Rainbow 

 trout YOY density averaged 1.09/10 ft and brown trout 0.30/10 ft 

 in the eight sampling locations in this reach. 



Densities of rainbow and brown trout YOY in the Clearwater 

 River (RM 34.7) near the mouth were 0.44 and 0.37/10 ft, 

 respectively. In Monture Creek, densities of rainbow and brown 

 trout YOY near the mouth were 1.70 and 0.57/10 ft, respectively. 



No bull or cutthroat trout YOY were observed in Reach 4. 



30 



