Scientific Investigations Report 2006-5111
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2006-5111
Prepared in cooperation with the Idaho Department of Environmental Quality
By Dorene E. MacCoy
Conversion Factors, Datums, and Abbreviations
Data Compilation and Analysis
Fish Communities and Related Environmental Conditions
Data Limitations and Potential Future Investigations
Appendix A. Relative percentage of abundance of fish species in the lower Boise River, Idaho
Figure 1. Location of study area in the lower Boise River Basin, southwestern Idaho.
Figure 2. Mean annual and mean monthly discharge rates for the Boise River recorded at the U.S. Geological Survey Glenwood Bridge near Boise, Idaho (13206000) and near Parma, Idaho (13213000) gaging stations.
Figure 3. Diversions, drains, and tributaries along the Boise River from Lucky Peak Lake to the Snake River, southwestern Idaho.
Figure 4. Mean monthly discharge for December and August recorded during pre- (1895–1916) and post-dam (1957–2002) periods at the U.S. Geological Survey Boise River near Boise gaging station (13202000), southwestern Idaho.
Figure 5. Mountain whitefish (Prosopium williamsoni).
Figure 6. Brown trout (Salmo trutta).
Figure 7. Rainbow trout (Oncorhynchus mykiss).
Figure 8. Shorthead sculpin (Cottus confusus) and mottled sculpin (Cottus bairdi).
Figure 9. Largescale sucker (Catostomus macrocheilus).
Figure 10. Bridgelip sucker (Catostomus columbianus).
Figure 11. Northern pikeminnow (Ptychocheilus oregonensis).
Figure 12. Smallmouth bass (Micropterus dolomieu).
Figure 13. Fish index of biological integrity scores by year calculated for low-flow sampling events (November to April) in seven reaches of the lower Boise River, 1988–2003.
Figure 14. Percentages of invertivores and piscivores versus percentages of omnivores and herbivores derived from 1996 fish collections in the lower Boise River, southwestern Idaho.
Figure 15. Changes in the occurrence of sculpin upstream and downstream of Lander Wastewater Treatment Facility, lower Boise River, southwestern Idaho, 1988–2003.
Figure 16. Comparison of relative weight equations calculated for mountain whitefish collected from the lower Boise River with the North American standard weight equation for mountain whitefish and measurements from least-disturbed rivers in southern Idaho.
Figure 17. Mountain whitefish length and weight relations for the lower Boise River and least-disturbed sites in southern Idaho, 1988–2004.
Table 1. Summary of U.S. Geological Survey and Idaho Department of Fish and Game sampling of fish communities in the lower Boise River, southwestern Idaho, 1974 to 2004.
Table 2. Fish sampling reach locations, lower Boise River, southwestern Idaho, 1988–2004.
Table 3. Habitat features measured for each subbasin of the historic (1867–1868) and recent (1994–2002), lower Boise River, southwestern Idaho.
Table 4. Median, minimum, and maximum values of instantaneous water-quality measurements and select constituent concentrations from sites on the lower Boise River, southwestern Idaho, 1994–2002.
Table 5. Occurrence of fish species in the lower Boise River, southwestern Idaho, 1988–2004.
Table 6. Selected metrics and Index of Biological Integrity scores calculated for fish samples collected during low-flow periods (November to April) from the lower Boise River and least disturbed sites in southwestern Idaho.
Table 7. Subbasin areas, selected land-use metrics, and fish Index of Biotic Integrity scores for selected sampling events on the lower Boise River, southwestern Idaho, 2000–03.
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Send questions or comments about this report to the author, D.E. MacCoy, (208) 387-1354.
For more information about USGS activities in Idaho, visit the USGS Idaho Water Science Center home page.