Scientific Investigations Report 2006–5230
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2006–5230
Table 9. Summary of habitat and hydrologic measurements for lower Morgan Creek (MC1), upper Salmon River Basin, Idaho, 2005.
[Values presented in cubic feet per second. Discharge passage criteria: Passage criteria taken from Thompson (1972) and Scott and others (1981); both width criteria must be met to ensure passage. Channel width: Represents measurements at three transects. Discharge estimates: Based on regional regression equations using basin and climatic characteristics (Hortness and Berenbrock, 2001); Q.xx, daily discharge exceeded xx percent of the time during the specified month; Qa, mean annual discharge. Abbreviations: WUA; weighted usable area; WUA optimum discharge estimates were based on PHABSIM (Physical Habitat Simulation) model output; EPT, Ephemeroptera, Plecoptera, and Trichoptera taxa; ND, not determined; <, less than]
| Lifestage | Discharge required for maximum WUA | Discharge required for adult salmonid passage 0.6-foot depth criterion | Discharge estimates | |||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Channel width | ||||||||||||||||||||
| Bull trout | Chinook salmon | Steelhead trout | EPT invertebrates | Greater than 25 percent (total) | Greater than 10 percent (contiguous) | July | August | September | ||||||||||||
| Q.80 | Q.50 | Q.20 | Q.80 | Q.50 | Q.20 | Q.80 | Q.50 | Q.20 | Qa | |||||||||||
| Adult | 15 | 42 | 42 | ND | 15, <11, 15 | <11, <11, <11 | 17.9 | 31.2 | 58.2 | 11.3 | 16.4 | 25.6 | 11.1 | 14.9 | 21.9 | 55.5 | ||||
| Spawning | 24 | 42 | 42 | ND | ND | ND | ||||||||||||||
| Immature | ND | ND | ND | 30 | ND | ND | ||||||||||||||
U.S.
Department of the Interior | U.S. Geological
Survey
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