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Instream Flow Assessment Upper Lemhi River and Canyon Creek, Idaho. Flow Characterization Study

机译：流量评估上游Lemhi河和爱达荷州峡谷溪流量特征研究

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The Bureau of Reclamation conducted flow characterization and habitat studies on the Upper Lemhi River and Canyon Creek, located in the Lemhi River sub-basin in Idaho, to identify stream flow needs to support relevant life history stages of summer steelhead (Oncorhynchus mykiss), spring Chinook salmon (O. tschawytscha), and bull trout (Salvelinus confluentus). Average snowpack level in the Salmon River Basin on April 1, 2005 was 78 percent, compared to 62 percent of the average snowpack in 2004. The Upper Lemhi River and Canyon Creek flows were continuously recorded using a stage recorder during the 2005 irrigation season. The Upper Lemhi River gaged flows ranged from 26 cfs on June 9 to 7 cfs on August 27. Unimpaired Canyon Creek flows ranged from 4 cfs on April 12 to 20 cfs on June 18 at the gage. Water temperatures were also monitored in 2005. Reclamation characterized flow needs for various life stages of the selected species using the Physical Habitat Simulation (PHABSIM) model at each study site. To address food resources of salmonids, streamflow needs for aquatic macroinvertebrates were assessed. Data were collected at a total of 10 study sites: five each on the Upper Lemhi River and Canyon Creek. Study sites were selected in accessible areas to represent mesohabitat types within each stream reach distinguished by unique hydrology, channel morphology, slope, or land use characteristics. Low, medium, and high flow measurements were attempted during the irrigation season at most sites downstream from the reference sites. In most cases, only medium and low flow conditions were measured because most of the high flows were diverted for irrigation. However, these conditions typically occur during the summer irrigation season with the diversions. Habitat modeling results reflected differences in stream channel hydraulics among study sites.

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