Biological Opinions - Bureau of Reclamation

Cause of
Incidental
Take
Habitat
Reduction
Elevated
water
temperature
DO
reduction
Decreased
outmigration
rates
Increased
disease
risks (C.
shasta)
Fish
relocation
Dewatering
Structural
placement
Table 13.6 Summary of annual incidental take of SONCC coho salmon expected to occur as a result of the
proposed action.
Life Stage
Fry
Parr and
Smolts
Fry
Parr and
Smolts
Parr
Smolts
Fry
Parr, and
Smolts
Fry
Parr, and
Smolts
Parr and
smolts
Parr or
smolt
General
Time
Late March
to mid-June
March to
June
May to mid-
June
May to June
June to
August
April to June
April to mid-
June
April to
August
May to mid-
June
May to June
June 15 to
November 1
Location
IGD (RM 190) to
Salmon River (RM
66)
Trees of Heaven
(RM 172) to
Rogers Creek (RM
72)
IGD to Scott River
(RM 143)
IGD (RM 190) to
Orleans (RM 59)
IGD (RM 190) to
Shasta River (RM
176)
Klamathon Bridge
(RM 187.6) to
Orleans (RM 59)
Trees of Heaven
(RM 172) to Seiad
Valley (RM 129)
IGD (RM 190) to
Salmon River (RM
66) and tributaries
in action area
Type of
Incidental
Take
Harm
Harm
Capture,
wound, or
killed
Killed
Amount or Extent of Incidental
Take
Measured by a surrogate of the
minimum average daily flows at
IGD during March to August
(Table 13.4) and the expected
EWA volumes relative to UKL
supply (Table 13.5).
Measured by a surrogate of the
minimum average daily flows at
IGD during March to August
(Table 13.4) and the expected
EWA volumes relative to UKL
supply (Table 13.5). In addition,
measured by a surrogate of up to
54 percent (via histology or 49
percent via QPCR) of the total
annual Chinook salmon juveniles
in the mainstem Klamath River
between the Shasta River and the
Trinity River may be infected
with C. shasta during the months
of May to July.
Up to 17 coho salmon juveniles
may be captured each year, of
which up to 1 may be wounded or
killed each year.
Up to 1 coho salmon juvenile
may be killed each year.
Up to 1 coho salmon juvenile
may be killed each year.
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