Mitigation for the Construction and Operation of Libby Dam
Mitigation for the Construction and Operation of Libby Dam
Mitigation for the Construction and Operation of Libby Dam
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Number Fish per 1000<br />
Feet<br />
140<br />
120<br />
100<br />
80<br />
60<br />
40<br />
20<br />
0<br />
Pre <strong>and</strong> Post Project Comparisons<br />
Cutthroat Trout p = 0.38<br />
Rainbow Trout p = 0.099<br />
Brook Trout p = 0.326<br />
Bull Trout p = 0.305<br />
Pre Project (2000-2001) Post Project (2002-2003)<br />
Years<br />
Cutthroat Trout Rainbow Trout Brook Trout Bull Trout<br />
Figure 23. Mean cutthroat, rainbow, brook, <strong>and</strong> bull trout densities (fish per 1000 feet)<br />
within <strong>the</strong> Grave Creek Demonstration Project area prior to (2002-2001) <strong>and</strong> after (2002-<br />
2003) <strong>the</strong> completion <strong>of</strong> <strong>the</strong> Grave Creek Demonstration Restoration Project. Data collected<br />
during 2000 <strong>and</strong> 2001 represent pre-project implementation fish abundances <strong>and</strong> were<br />
collected using single pass electr<strong>of</strong>ishing. Fish abundance data collected in 2002 represents<br />
post-project implementation fish abundances <strong>and</strong> was collected via snorkel counts. Upper<br />
95% confidence intervals are represented by <strong>the</strong> whisker bars.<br />
83