Klamath Water Users
December 12, 2003
Salmon Rearing Habitats in the
Main Stem Klamath River
Vogel, fisheries scientists with Natural Resources Scientists, Inc
HERE. This page's summary is by Dan Keppen, KWUA Executive
Here for Vogel's biography
and additional reports.
Hardy is currently working to complete the draft Phase II report that
recommends higher than normal Klamath River flows. Recall that an earlier
version of the Hardy effort was a primary reason for the elevated Iron
Gate Dam flow schedule included in the disastrous 2001 Klamath Project
operations plan. The attached report-prepared by David Vogel, fisheries
scientists with Natural Resources Scientists, Inc - serves to further
detail our concerns with the Draft Hardy Phase II Report's treatment of
Klamath River flows. Key concerns outlined in the report:
supporting data, the draft Phase II Report relied on assumed habitat usage
of Chinook fry in the main stem Klamath River as a surrogate for coho fry,
despite well-known differences in habitat criteria between the species.
- It appears
the authors have misinterpreted the known rearing habitat characteristics
for coho salmon in an attempt to re-create that habitat (in a theoretical
sense) in the main stem Klamath River.
- The draft
Phase II report introduced mathematical computations into computer modeled
fish habitat that skewed outputs to conclude very high flows would create
more rearing habitat.
development of the HSC for the Klamath River in the draft Phase II Report
was severely constrained by data collection during high flow conditions
and created unintentional bias in the results. This problem was further
compounded by inappropriate sampling techniques that resulted in the
misinterpretation of fish utilization of habitats in the Klamath River.
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