. The Big Blackfoot River restoration progress report for 2002 and 2003 . Fish populations; Fishes; Fishery management; Trout fisheries; Stream ecology; Blackfoot River (Mont. ). 3000 â o 2500 c S 2000 I 1500 - 1 - 1000 o 500 0 Annual Mean Streamflow (Cfs) Long-term mean I llllllllJllj 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 Figure 10. Annual mean discharge for calendar years 1988-3003. Results/Discussion Results Part I: Blackfoot River Environment Blackfoot River Discharge: USGS Bonner gauging station #12340000 By 2002 and 2003, the Blackfoot River wate
. The Big Blackfoot River restoration progress report for 2002 and 2003 . Fish populations; Fishes; Fishery management; Trout fisheries; Stream ecology; Blackfoot River (Mont. ). 3000 â o 2500 c S 2000 I 1500 - 1 - 1000 o 500 0 Annual Mean Streamflow (Cfs) Long-term mean I llllllllJllj 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 Figure 10. Annual mean discharge for calendar years 1988-3003. Results/Discussion Results Part I: Blackfoot River Environment Blackfoot River Discharge: USGS Bonner gauging station #12340000 By 2002 and 2003, the Blackfoot River watershed was subject to a third and fourth year of consecutive drought. Mean discharge was 1501 cfs in 2002 and 1330 cfs in 2003, compared with a long-term mean of 1596 cfs (Figure 10). The relative drought index for the Blackfoot River at Bonner showed daily river discharge at <75% of mean monthly flow on 135 days for 2002 and 196 days for 2003, with daily river discharge <50% of monthly mean on 16 and 23 days respectively (Figure 11). For the calendar year Number of Days Stream Discharge 300. 260 200 150 100 1988 -90 '95 â 00 2003 Figure 11. Relative drought index near Bonner: number of days river discharge was < 50% and < 75% of monthly mean for calendar years 1988- 2003 2002, flows were particularly low during late winter and early spring with daily flows <75% of mean monthly for 77 of 121-day period between February and May. During 2003, winter flows approached normal although non-winter flows (May-October) were very low, falling to <75% of mean monthly flows on 149 of 184 days. 27. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Pierce, Ron; Podner, Craig; Anderson, Ryen; Montana. Dept. of Fish, Wildlife, and Parks. Missoula, Mont. : Montana Fish, Wildlife and Parks
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